Hayward HC Series User manual

Universal HC Series Heater ®
Troubleshooting Guide
TSG-UHC21a Copyright 2021 Hayward Holdings

High Voltage Electrocution Hazard
Hazardous voltage can shock, burn, cause serious injury
and or death. To reduce the risk of electrocution and or
electric shock hazards:
•Turn off power to unit before making repairs
•Only qualified technicians should service heater
•Replace damaged wiring immediately
•Ensure appliance is properly grounded and bonded
2
!
Warning
Safety Precautions

ICB and Fuse Board Layout
4-
5
Troubleshooting: (cont.)
Pg.
27
-57
Sequence of Operation: Normal/Failure to Light
6
5. “BD” Code
38
Gas and Electrical Connections
7
6. "EE" or "CE" Code
39
How To:
Pg.
8-
26
7. "IO" or "SB" Code
40
Program Heater Bypass & Temperature Lockout
9-
11
8. "SF" or "HS" Code
41
Change/Replace Gas Mixer
12
9. "PF" Code
42
Test/Adjust Gas Pressure
13
-15
10. “HF” Code
43
Burner Inspection
16
-19
11. "LO: Code
44
-47
Change/Replace Combustion Chamber
20
-26
12. "IF" Code
48
-49
Troubleshooting:
Pg.
27
-57
13. "AC" Code
50
Diagnostic Codes and Part Numbers
28
-29
14. "A1, A2, A3" Codes
51
-53
Wiring Diagram
30
15. "b1" Code
54
1. Heater not powering up
31
-33
16. "b2" Code
55
2. Open FC1&/FC2 Fuse
34
17. "b3" Code
56
3. Open FC3&/F1 Fuse
35
-36
18. "b4" Code
57
4. Open FC4 Fuse
37
3
Table of Contents

4
A
Remote Control: 24VAC (E1)
B
Flame Sensor (E4)
C
Temperature Sensor (E2)
D
Display Output: 24VAC (E7)
E
3A Fuse (F1)
F
Low Voltage R & C: 24VAC (E12,
E13)
G
Gas Valve & Safety Switches:
24VAC (E11)
H
High Voltage: 120VAC (E10)
I
Blower/Inducer (E6)
JIgnitor (E3)
C
H
G
F
D
E
JI
B
A
Integrated Control Board Layout (ICB)

5
Field Wiring Panel Layout
G
A
C
F
B
D
E
ATransformer Secondary: 24VAC
(right) &
120VAC (left) (P4)
BVoltage Selector 240 OR 120VAC
determined by plug (P2): NOTE: 240
VAC
plug factory installed
CFuse: 3a protects transformer high
voltage secondary, will fail with blower,
ignitor or ICB failure (FC4)
D
Fuse: 3A protect primary input voltage,
will fail with excessive voltage, improper
wiring, shorted transformer or fuse
board (FC1 & FC2)
EHigh Voltage Output: 120VAC (P6)
FLow Voltage Output: 24VAC (P5)
G
Transformer Primary: 120/240VAC (P3)
H
Power connection for junction boxes:
120/240VAC (P1)
H

The control continually compares the set temp to the actual water temp.
When the water temp is 1º below the set point the following sequence starts:
6
UHC Sequence of Operation: Normal

7
UHC Electrical & Gas Connection
Bonding Lug
Low Voltage
Gas Port
Alternate
Gas Port
Low Voltage
Wiring
High/Line
Voltage
L1
LN
L2 G G
240V
Factory Wired
120V
See Manual
The low voltage and high/line voltage compartments can be reversed but NOT shared.

Universal HC Series Heaters®
How To:

9
How To: Program Heater Bypass Operation
Follow the included steps to place the heater in bypass operation for external control.
NOTE: the maximum temperature set point is 104° F.
Press the ‘MENU ICON’ button to place the
heater in ‘STANDBY’. Press and hold the ‘MINUS’ button and ‘MENU ICON’ button for 3 seconds.
‘bo’ will appear on the display when the
heater has successfully entered bypass
operation.
Once in bypass, press the ‘MENU ICON ’
button until ‘POOL’ or ‘SPA’ is illuminated.
Step 2
Step 3 Step 4
Step 1

10
How To: Program Temperature Lock-Out
NOTE: The default Max temp set points are 90ºF (Pool) 104ºF (Spa).
When setting the max temp lock-out set point, the LEDs & display should flash rapidly.
Press the ‘MENU ICON’ button to place the
heater in ‘STANDBY’ mode. Press and hold the minus & plus buttons for 3 seconds.
The ‘SPA’ indicator will flash & the display
should show the Max Temp set point. Raise or lower the temperature displayed using the minus or plus button.
Step 2Step 1
Step 3 Step 4
Follow the included steps to lock the maximum temperature allowed.