Hayward HeatPro HP50TA User manual

Hayward/Summit Heat Pump
Troubleshooting Guide
© 2012 Hayward Industries

Leave Blank- Inside Front Cover

Heat Pumps Covered by This Guide
HeatPro
HP50TA, HP20654T, HP20654BT, HP20654TC, HP20854T, HP20854BT, HP20854TC,
HP21104T, HP21104TC, HP21404T
Note: HP50TA, and HP21404T heat pumps while labeled as HeatPro,
are built on the Summit platform.
Use Summit wiring diagrams, and error codes in your diagnostics
Summit/ HeatMaster/ EnergyTherm/ EasyTemp
SUM25TA, SUM3TA, SUM3TAC, SUM4TA, SUM4TAC, SUM5TA, SUM5TAC
SUM8TA, HML50TA, HML65TA, HML65TAC, HML80TA, HML80TAC, HML110TA
HML110TAC, HML125TA, HET50BTA, HET65BTA, HET110BTA, HET125BTA
HCB50BTA, HCB65BTA, HCB65BTAC, HCB80BTA, HCB80BTAC, HCB110BTA,
HCB110BTAC

Table of Contents
Important Safety Information
1
HeatPro Parts Diagram
18
Basic Operation of Heat Pump
2
HeatPro Parts List
19
Normal Operation of Heat Pump
3-4
Summit/EasyTemp/HeatMaster Parts Diagram
20
Setting Heat Pumps for Remote Operation
5-6
Summit/EasyTemp/HeatMaster Parts List
21
Common Error Codes LP
7
HeatPro Wiring Diagram
22
Common Error Codes HI/HP
8
Summit/EasyTemp/HeatMaster Wiring Diagram
23
Common Error Codes PO/OP
9
Summit/EasyTemp/HeatMaster Setup Menu
24
Common Error Codes Pc/SH
10
Heat Pump Specifications
25
Common Error Codes dPO/cOP
11
Flow Charts PS/Flo
26
Common Error Codes dPc/cSH
12
Flow Charts HI/HP
27
Temperature/Resistance Charts
13
Flow Charts OP/PO- SH/Pc
28
Common Error Codes Flo/PS
14
Flow Charts cOP/dPO - cSH/dPc
29
Common Error Codes Blank Display
15
Flow Charts LP
30
Common Error Codes Fs/dEF
16
Alternative Leak Detection Methods
31
Hot Gas Bypass
17

!
High voltage. Danger! Use
extreme caution. Do not
attempt if you are not a
qualified servicer.
Warning!
The following heat pump Troubleshooting Guide is to be used in diagnosing and repairing Hayward &
Summit branded pool heat pump systems containing R-410Arefrigerant . They are not intended for use
with any other manufacturers heat pumps.
Heat Pump pool heaters are similar to the heat pumps for home heating and cooling in that they contain
refrigerant. As such, service personnel should observe EPA regulations for refrigerant handling. Pool heat pumps
operate on 240 volts A/C. There is a risk of electric shock at all terminals and the heat pump should only be
serviced by trained personnel.
To use this guide, determine the model number of the heat pump and the nature of the problem. Refer to
the Table of Contents to find the appropriate page for the problem and follow the flow charts to the solution.
If you have further questions:
Contact Hayward’s Technical Service Department at 908-355-7995
Safety

Heat Pro and Summit heat pumps generally operate in the same fashion. Power is connected to
the contactor per the installation instructions. Ensure the water line ‘in’ and ‘out’ connections are
correct. Set the control for pool or spa operation. Adjust the thermostat setpoint above the water
temperature. In approximately 3 to 5 minutes the heat pump will begin ‘heating’. This 3 to 5 minute
delay is important as it protects the compressor from short cycling. This time delay is part of the
control circuit of the heat pump.
Hayward Heat Pro units have a 5 minute delay during which no operation will occur.
Summit brand units have a 3 minute delay, but the fan will come on immediately once the heat pump
is turned on and the thermostat raised to a setpoint above the pool temp.
The time delay will delay the start of the heat pump any time power is interrupted to the heat pump.
When the heat pump satisfies the thermostat and shuts off, the time delay will not allow
the heat pump to restart for 3-5 minutes.
The thermostat will turn the heat pump on and off
as needed to keep the pool at the desired temperature.
Note: Heat pumps will not operate when the pool pump is off.
Basic Operation of Heat Pump

Normal Operation of Heat Pump
All of the heat pumps covered in this guide are charged with R-410Arefrigerant
If you have a system that is charged with R-22 refrigerant, and require assistance
call our Technical Support Department at 908-355-7995
Normal Refrigerant Operating Pressures
Low side 125-135psi
Lower ambient temperatures will result in lower low side (suction) pressures.
High Side 290-400psi
Higher water temperatures will result in higher high side (discharge) pressures.
Normal Air Temperature Differential
This is the difference in the temperature of the air entering the coil (ambient air),
and the air being discharged out the top by the fan.
15-20 degrees Fahrenheit
Low relative humidity and/or lower than normal ambient temperatures can cause
lower than normal temperature differentials.
Note: This is the best way to determine if a heat pump is heating

Normal Operation of Heat Pump
Water In and Around Heat Pump
The heat pump evaporator coil (the surrounding coil) condenses moisture out
out of the surrounding air. As much as 3-5 gallons per hour of run time
is common in higher humidity areas. This is normal and in fact increases the
efficiency of the heat pump. The heat pump base pan design allows for a drain line
to be attached using readily available components to drain this water away if it is
a problem. In most installation situations however, this moisture simply runs off the
pad and is absorbed into the ground.
Best Methods to Determine if Heat Pump is Actually Leaking
1. If the heat pump is leaking, it will continue to leak even when the heat pump is not running.
If the water you are seeing is condensation from the evaporator coil it
will dry up in a few hours.
2. Test the water with a chlorine test strip. If the water shows no or very low levels of chlorine
the water is condensation. If the test strip shows levels of chlorine similar to pool water,
you may have a leak.

Setting Heat Pumps for Remote Operation
Use Terminals 1 and 2
for 2 wire remote connection
Heat Pro Heat Pumps
For 2 wire remotes such as Hayward’s Pro-Logic, attach the 2 low voltage
wires from remote to terminals 1 and 2 on terminal block TB201. Set heat
pump to standby mode (three red dots scrolling across screen). Heat
pump is now ready for remote operation.
Heat Pro Heat Pumps
For 3 wire remotes where the desired temperature is set on the heat pump,
attach the 3 wires from your remote to the 3, 4 and 5 terminals on terminal
block TB201. Attach the pool wire to terminal 3, the common wire to
terminal 4 and the spa wire to terminal 5. Set both the pool and spa desired
temperature on the heat pump before turning on the remote. Once the
remote is calling for pool or spa you will not be able to change the function
on the heat pump without turning the remote off.
Use Terminals 3,4,& 5
for 3 wire remote connection
Note: Heat Pro HP21404T, and HP50TA
are built on the Summit platform. For remote
connection see next page.

Setting Heat Pumps for Remote Operation
Summit Platform Heat Pumps
Attach 2 wires from remote to terminals marked ‘P’ and ‘S’ on the lower right corner of the control board.
Set Pool temperature to off. Set Spa temperature to ‘104’. Press and hold ‘Set/Select’ button until ‘Loc’
appears. Release the ‘Set/Select’ button. Press up arrow until 50 appears. This unlocks the set up menu.
Release up arrow. Press and release ‘Set/Select’ button 5 times or until ‘P_S’ appears.
Press up or down arrow until ‘E’appears. Heat pump is now ready for remote operation.
Note: Move quickly between steps, if the temperature shows on display you will have to start over.
Loc
Attach 2 wires from remote to terminals P and S

Common Error Codes
LP LP
HeatPro Display
Summit Display
LP on Display
LP is an indication the low pressure switch is open. The
switch opens when the refrigerant pressure drops below
80PSI, and will automatically reset at 120PSI.
Sustained ambient temperatures below 21⁰F will cause the LP
error, however once the ambient temperature rises above
40⁰F the switch will close automatically.
Troubleshooting LP
The most common cause of LP on display is a loss of refrigerant pressure from a leak in the
refrigeration system. If refrigerant pressure is below 80PSI at your access port there has been a
significant loss of charge. Thoroughly leak check the system with an electronic leak detector, or
alternatively pressurize the system with dry
nitrogen and use a liquid leak detector such as “Big Blue”. If a leak still cannot be located inject UV
dye into the system and recharge to full charge.Allow several days to as long as several leaks
weeks -depending on apparent
severity of leak-, with normal heat pump operation for the dye to leak out with the refrigerant, and
return with UV light to determine leak location.
Once leak is located: Repair leak, evacuate system to a minimum 500 micron vacuum, and
recharge to factory charge (on data plate)
Other causes of LP error code
An intermittent LP code can be caused by a bad fan motor or capacitor. Check capacitor and
motor.
Bad LP switch. Check refrigerant pressure at access port. If pressure is above 120PSI check the
continuity of LP switch. Switch should be closed. If open replace switch. The LP switch is a screw
on style and does not require removing refrigerant charge to change. Be sure to use a thread
sealant when installing new switch. Always use a back up wrench when installing new pressure
switch.
If switch is closed, but LP is displayed check wires to switch for breaks. If no breaks are found
replace control board.
LP Switch
Note blue wires.
LP switch common to all
R-410A heat pumps

Common Error Codes
HP HI
HeatPro Display
Summit Display
HP/HI on Display
HP or HI is an indication the high pressure switch is open.
The switch opens when the refrigerant pressure rises above
590PSI, and will automatically reset at 440PSI..
Troubleshooting HP/HI
The most common cause of HP or HI error code is restricted water flow. An open bypass valve that
allows the heat exchanger to be pressurized, but does not allow flow through it is a likely culprit.
When heating a spa, there may not be sufficient flow through the system for proper operation at higher
water temperatures.All heat pumps require a minimum of 30 gpm water flow, but at higher water
temperatures a higher flow rate of at least 40 gpm may be required.
Other causes of HP/HI error code
Heat Pump runs for a few seconds then fails on HP/HI error
Thermostatic Expansion Valve (TXV) failure. Loss of charge in the power head of the TXV closes the
valve and will result in a HP or HI error code. To determine if this is the problem, observe both high and
low pressure readings when heat pump is running. If TXV is bad high pressure will quickly rise to
590PSI, while at the same time the low pressure will quickly drop.
Refrigerant Overcharge Overcharge of the heat pump is unlikely, but not impossible. Heat pumps do not
leave our factory overcharged, so the only way it can occur is if service has been previously performed
on the system and the technician overcharged the refrigerant after or during a repair. To determine if this
is the issue recover all refrigerant from the system, pull a 500 micron vacuum, and then recharge to
factory charge (on data plate).
Heat Pump does not run- HP/HI on display
Bad HP switch. Since the HP switch is an automatic reset, and the pressures within the refrigeration
system will equalize shortly after the heat pump cuts off, HP or HI on the display without the heat pump
running will not be related to the refrigerant pressure check the continuity of HP switch. Switch should be
closed. If open replace switch. The HP switch is a screw on style and does not require removing
refrigerant charge to change. Be sure to use a thread sealant when installing new switch. Always use a
back up wrench when installing new pressure switch.
If switch is closed, but HP/HI is displayed check wires to switch for breaks.
If no breaks are found replace control board.
HP Switch
Note black wires.
HP switch common to all
R-410A heat pumps

Common Error Codes
PO OP
HeatPro Display
Summit Display
PO/OP on Display
PO or OP is an indication of an open water
temperature sensor.
Summit style heat pumps use a 4.8k ohm sensor,
and HeatPro heat pumps use a 10k ohm sensor.
.
Troubleshooting PO/OP
The most common cause of PO or OP error code is an open water temperature sensor.
Check sensor wiring for breaks, and check sensor resistance against the correct
temperature/resistance chart located on page 11.
If resistance is infinite or very high according to the chart replace the sensor.
If sensor reads the correct resistance for the temperature of the water, replace control board
SH
Pc
Pc/SH on Display
Pc or SH is an indication of an shorted water
temperature sensor.
Summit style heat pumps use a 4.8k ohm
sensor, and HeatPro heat pumps use a 10k ohm
sensor.
.
HeatPro Display
Summit Display Troubleshooting Pc/SH
The most common cause of Pc or SH error code is a shorted water temperature sensor.
Check sensor wiring for shorted wires, and check sensor resistance against the correct
temperature/resistance chart located on page 11.
If resistance is 0 or very low according to the chart, replace the sensor.
If sensor reads the correct resistance for the temperature of the water, replace control board

Common Error Codes
dPO
cOP
HeatPro Display
Summit Display
dPO/cOP on Display
dPO or cOP is an indication of an open defrost
temperature sensor.
Summit style heat pumps use a 4.8k ohm sensor,
and HeatPro heat pumps use a 10k ohm sensor..
Troubleshooting dPO/cOP
The most common cause of dPO or cOP error code is an open defrost temperature sensor.
Check sensor wiring for breaks, and check sensor resistance against the correct
temperature/resistance chart located on page 11.
If resistance is infinite or very high according to the chart replace the sensor.
If sensor reads the correct resistance for the temperature of the water, replace control board
dPc/cSH on Display
Pc or SH is an indication of an shorted water
temperature sensor.
Summit style heat pumps use a 4.8k ohm sensor,
and HeatPro heat pumps use a 10k ohm sensor.
cSH
HeatPro Display
dPc
Summit Display Troubleshooting dPc/cSH
The most common cause of Pc or SH error code is a shorted defrost temperature sensor.
Check sensor wiring for shorted wires, and check sensor resistance against the correct
temperature/resistance chart located on the page11.
If resistance is 0 or very low according to the chart, replace the sensor.
If sensor reads the correct resistance for the temperature of the water, replace control board

4.8 K ohm Sensor Temperature / Resistance Chart
Temperature °F
Temperature °C
Sensor resistance (Kohm)
180.0
82.2
0.549
175.0
79.4
0.601
170.0
76.7
0.659
165.0
73.9
0.722
160.0
71.2
0.793
155.0
68.4
0.872
150.0
65.7
0.961
145.0
62.9
1.06
140.0
60.2
1.17
135.0
57.4
1.294
130.0
54.7
1.434
125.0
51.9
1.591
120.0
49.2
1.768
115.0
46.4
1.968
110.0
43.7
2.194
105.0
40.9
2.451
100.0
38.2
2.741
95.0
35.4
3.072
90.0
32.7
3.448
85.0
29.9
3.879
80.0
27.2
4.37
75.0
24.4
4.935
70.0
21.7
5.583
65.0
18.9
6.328
60.0
16.2
7.187
55.0
13.4
8.18
50.0
10.7
9.334
45.0
7.9
10.671
40.0
5.2
12.23
35.0
2.4
14.044
30.0
-0.3
16.167
25.0
-3.1
18.655
20.0
-5.8
21.581
15.0
-8.6
25.036
10.0
-11.3
29.11
5.0
-14.1
33.95
0.0
-16.8
39.683
10K ohm Sensor Temperature / Resistance Chart
Temperature °F
Temperature °C
Sensor resistance (Kohm)
180.0
82.2
1.171
175.0
79.4
1.281
170.0
76.7
1.402
165.0
73.9
1.538
160.0
71.2
1.688
155.0
68.4
1.856
150.0
65.7
2.044
145.0
62.9
2.254
140.0
60.2
2.489
135.0
57.4
2.752
130.0
54.7
3.049
125.0
51.9
3.382
120.0
49.2
3.758
115.0
46.4
4.183
110.0
43.7
4.664
105.0
40.9
5.208
100.0
38.2
5.827
95.0
35.4
6.53
90.0
32.7
7.333
85.0
29.9
8.249
80.0
27.2
9.297
75.0
24.4
10.5
70.0
21.7
11.882
65.0
18.9
13.473
60.0
16.2
15.31
55.0
13.4
17.435
50.0
10.7
19.9
45.0
7.9
22.764
40.0
5.2
26.1
35.0
2.4
29.998
30.0
-0.3
34.561
25.0
-3.1
39.919
20.0
-5.8
46.225
15.0
-8.6
53.669
10.0
-11.3
62.479
5.0
-14.1
72.937
0.0
-16.8
85.387
Temperature/Resistance Charts
For use with HeatPro Heat PumpsFor use with Summit Heat Pumps Using Temp/Resistance Charts
Determine correct temperature of air or
water using accurate thermometer. Set
VOM meter to a minimum of 20K ohms.
Read resistance of sensor.(wire to wire)
Resistance should match the temperature
shown on the chart.
In the example above:
The meter on the left shows a temperature
of 73.6⁰F
The meter on the right shows a resistance
through the sensor of 10.84K ohms.
Checking the chart on the right for 73.6
degrees shows the resistance should be
somewhere between
11.882 (70⁰) and 10.50 (75⁰)
Sensor tests good.
HeatPro Sensors
Defrost Water
Summit Sensors
Defrost Water

Common Error Codes
PS
HeatPro Display
FLo
Summit Display
Flo/PS on Display
Flo or PS on the display is an indication of an open water
pressure switch. Though water pressure switches
occasionally fail, the majority of Flo/PS errors are water
flow related. Confirm that pump is running and filter is clean
before proceeding with any further troubleshooting.
The water pressure switch is located in the electrical panel.
Troubleshooting Flo/PS
The most common cause of HP or HI error code is low or no water flow. Open bypass valves, time
clocks in the off cycle, pumps turned off, and dirty filter account for the majority of Flo and PS errors.
If water flow is confirmed check continuity of the flow switch with an Volt/Ohm meter. See Below
Disconnect wires from water pressure switch and with the pool pump running and any bypasses
closed check for continuity through the switch, not through the wires. If there is no continuity, try
adjusting the switch slightly by turning the thumbscrew counterclockwise 1 full turn. If there is still no
continuity, replace switch.
If switch is closed, but Flo/PS is displayed check wires to switch for breaks. If no breaks are found
replace control board.
Note: Any time water pressure switch is adjusted-After adjusting switch cut off pool pump to ensure
heat pump cuts off on no water flow.
To test continuity of flow switch:
Remove orange wires from switch for HeatPro
Remove purple wires from switch for Summit
Set VOM to Ohms, and check for continuity at
switch- not wires.
Summit Water Pressure Switch HeatPro Water Pressure Switch

Common Error Codes
HeatPro Display
Summit Display
Blank Display
A blank display is an indication of no low voltage to control.
A tripped breaker is a likely cause.
On HeatPro models a blown 1 amp fuse will result in a blank
display
Troubleshooting a Blank Display
Check for 240 volts to contactor at L1 and L2
terminals. If there is 240 volts at L1 and L2 check for
24 volts between blue and yellow wires coming from
transformer.
On Summit units if 24 volts are present at blue
and yellow wires replace control board.
On HeatPro units if 24 volts are present check
for blown fuse on interface board. If fuse is good
replace control board
Common causes of blown fuse or bad
transformer are pinched or shorted low voltage wires
to low and high pressure switches. Check all wiring
for short or ground
Contactor coil shorted or grounded. Contactors
should have approx. 10 Ohms resistance through
coil, and there should be no reading of continuity to
ground.
Replace contactor if resistance exceeds 12 Ohms, or
there is any continuity to ground.
Summit
HeatPro
Check for 24 volts AC at
blue and yellow wires
1 Amp fuse to protect
low voltage circuit
HeatPro only

Common Error Codes
deF
HeatPro Display
FS
Summit Display
FS/deF on Display
FS or deF on the display is an indication that the
heat pump is in the defrost mode.
If outdoor ambient temperatures are low to mid 50’s
or below this is normal operation
Troubleshooting FS/deF
Normal display when heat pump is in defrost mode. Defrost can
occur any time the outdoor ambient temperatures fall into the mid
50’s or below.
If you have FS/ deF when temps are above mid 50’s
This could be an indication the defrost temperature sensor is
failing. Check sensor against resistance charts on page 11. If
sensor resistance does not match with correct reading from chart
replace sensor. If resistance is correct replace control board
Summit
Defrost Sequence
Heat Pro
When defrost sensor senses a coil temperature of 29⁰F, the control
board cuts the compressor off but leaves the fan running for 15
minutes, the display will show only the water temperature during this
time. If temperature of sensor is 50⁰F or above after 15 minutes the will
compressor restart and the heat pump is operating normally. If the
temperature has not reached 50⁰F the heat pump will go through up to
2 more 15 minute cycles. If after the 3rd cycle the temperature is still
not above 50⁰F the heat pump will shut down for 2 hours and show
deF on the display.
Defrost Sensor Wire Location Defrost Sensor Wire Location
HeatPro
Note: Defrost sensors are attached
to suction refrigerant line with
the TXV bulb.
Summit
When defrost sensor senses a coil temperature of 29⁰F, the control cuts the compressor off and leaves the fan running. The
display shows FS. The heat pump will continue to operate in this way until the sensor senses 42⁰F. Once the sensor reaches 42⁰F
the compressor will restart and the heat pump is operating normally.

Hot Gas Bypass (HGBP)
designated by a C at end of model number
A
B
C
D
A. Liquid line to TXV
B. Hot gas line to HGBP is tee’d
into the hot gas line going to
the condenser.
C. Hot gas line from HGBP is tee’d
into liquid line downstream of TXV
D. Liquid line downstream of TXV
E. Low pressure tube attached to
suction line entering compressor
E
Sequence of Operation
The diaphragm in the HGBP
regulates the suction pressure
by opening and closing the valve
and allowing some of the hot gas that
would normally go into the condenser
to flow into the liquid line
downstream of the TXV.
As the suction pressure drops below
98 psi, (~31⁰ F) loss of pressure
from the suction line on the diaphragm (E)
will result in the HGBP valve opening
to allow hot gas to enter the liquid line
downstream of the TXV. This will
keep the suction pressure
up and the evaporator temperature
above the defrost point, allowing the
heat pump to operate in cooler
temperatures.
Trouble Shooting:
Symptoms of a failed hot gas bypass
1. Stuck open- abnormally high superheat (more than 15⁰ F), loss
of heating capacity
2. Stuck closed- heat pump defrosts more than normal, will not run at lower
temperatures (below 50⁰ F)

Note:
HP50TA built on Summit platform.
Use SUM25TA parts list
HP21404T built on Summit platform.
Use SUM8TA parts list
HeatPro Exploded View