Carrier bryant Multi-Zone 38MARBQ09 18AA3 Series User manual

Carrier & Bryant Ductless
Service Manual
Carrier Enterprise
Pub. Date –6.25.2021

Table of Contents
Pages 4 ~ 6 1st Steps in Ductless (DLS)Troubleshooting
Error Page Description
E1 7 All Models
EE 10 40MBD Ducted Water Level
E3 11 40MAQ High Wall Fan Error
13 40MBD Ducted Fan Error
15 40MBQ Ducted Fan Error
E4/E5 17 40MAQ High Wall Sensor Error
40MBD Ducted Sensor Error
40MBQ Ducted Sensor Error
40MBC Cassette Sensor Error
40MBF Floor/Ceiling Sensor Error
F1/F2/F3 20 38MAQB Outdoor Sensor Error
38MAQBR Outdoor Sensor Error
38MARB Outdoor Sensor Error
F5 24 38MAQB Outdoor Fan Error
26 38MAQBR Outdoor Fan Error
27 38MARB Outdoor Fan Error
P4 28 All Single Zone Outdoor Units

Table of Contents (end)
Service Procedures
29 How Ohm a Reactor
30 Compressor Check 1 –How to Meg a Compressor
31 Compressor Check 2 –Ohming a Compressor
32 38MGR Error Code Retrieval
33 Heating & Cooling Compensation
37 Service Settings –Wireless Remote RG10
39 Service Settings –Wireless Remote RG57
41 Service Settings –Wireless Remote RG66
Outdoor Unit PCB Removal Procedures
43 38MARBQ12AA1 Outdoor Units
38MARBQ09~18AA3 Outdoor Units
46 38MARBQ24~36AA3 Outdoor Units
51 38MARBQ24~36AA3 Outdoor Units
55 38MAQB09~12R--1 Outdoor Units
58 38MAQB09~12R--3 Outdoor Units
61 38MAQB18~30---3 Outdoor Units
65 38MGRQ30D--3 Outdoor Units

1st Steps for DLS Troubleshooting
If error is already displayed, make note of it. If Multi-Zone check
each Indoor Unit for error. If no error displayed, wait up to 5
minutes for error to reappear. Some errors are constant retry
and will only appear every 3 to 5 minutes to display again.
During this time either a normal display or an “88” will be seen.
If the system is a Multi-Zone 38MGR36 or 48 go to the
outdoor unit and pull the last error code from the Main PCB.
Procedure is towards the back of this guide. After code is
retrieved go to next step.
Recycle power and try system again. Give the system a
minimum of 10 minutes for error to appear again.
If error appears again, go to the flow chart for the error
displayed and work the error.
Things to check during any troubleshooting service call.
•Power to the units? Within limits?
•All wire harness connected and fully seated in their
sockets?
•Is the end user operating the system correctly?
•Raise or lower the set point (Heat vs. Cool) 5 or more
degrees, wait 10 minutes, system come ON?
On Multi-Zone systems, operate each zone independently first.
Check Heating & Cooling if temperature permits. This will help
rule out cross piping and wiring. Even if the system has been
installed for some time, still check this. It is often missed at the
time of start up.

1st Steps for DLS Troubleshooting (cont.)
If system has no error but still not preforming well, remove the
refrigerant charge (weighing it out) and recharge the system.
Make sure to check the additional charge calculation if one is
needed.
If the end user’s complaint is related to over or under shooting
temperature of the space, the sizing of the equipment to the
application should be checked. Keeping in mind the below.
•Minimum BTU output of the equipment
•Size of the head and the BTU requirements
of the space it is located within.
In some cases the Heating or Cooling Compensation setting can
be adjusted to help off set the temperature over or under
shooting. Explanation and instructions are in this guide.
For Defrost issues the following should be checked first.
•Refrigerant charge
•Equipment sizing to the application
For Defrost issues on systems with a 24-Volt Interface installed
Any outdoor unit made prior to 2.01.2021 may need a main
PCB upgrade. If your unit’s serial number starts 0421V or lower
an upgrade may be needed. Check with CE Tech Support.

1st Steps for DLS Troubleshooting (end)
Tools/Material required for DLS Troubleshooting & Servicing.
All the same tools required for properly installing Ductless
equipment. See CE’s Ductless Install Training for more details.
In addition to the above, the following are a must have.
•A Megger –This is crucial for checking out a
compressor. An Ohm meter is useful, but a Megger
is essential.
•Conductive Grease –This is needed when replacing
some of the PCB’s in the outdoor units. This can be
purchased through CE or online.
•A spare wireless remote control, part numbers:
RG57 –17317000A34063
RG10 –17317000A59628
RG66 –17317000A45681
•Support material from CE or Carrier. Service
Manuals, Product Data. Download to your
electronic device before going to the site.

Error Code
E1
–Indoor / Outdoor Unit Communication Error
Indoor Unit or Wired Control Display
–E1
Dr. Smart Display (Debugger)
–E1
Malfunction decision conditions
The indoor unit cannot communicate with the
outdoor unit
Supposed Causes
• Wiring mistake
• Short
-circuited component
• Indoor Unit PCB
• Outdoor
PCB
Troubleshooting: Error is only displayed every 3 minutes, during this time you may
see either “normal display” or “88” on indoor unit or wired control.
E1 is often seen on the day of start up for a new system. Typically due to an electrical issue
with the field installed wire between the Indoor & Outdoor units. There should be no solid wire
installed between the Indoor & Outdoor, if this was done change this out first. Also make sure
all wire stands are landed in the terminal. Repair connections due to over stripped wires.
Is there a Condensate Pump Safety Switch tied in? Check this first, make sure it has not tripped
and opened up it’s normally closed contacts. The switch can break “L1” or “L2”, do not break “S”.
If E1 still present, turn power OFF and disconnect the field supplied “S” or “3” wire from both
ends. Reapply power and check for induced voltage on the communication wire. With a meter
measure the field supplied “S” or “3” wire to ground. Zero voltage on the communication wire is
preferred. If 20 or more volts are measured and Communication Errors persists, fix or replace all
4 wires.
Once all you have verified the above, proceed below.
DO NOT CHECK IN STANDBY, system must be ON and calling for Heat or Cool.
Set your multimeter to DC Volts.
If no error is displayed, wait a minimum of 8 minutes for error to appear or measuring voltage.
Measure DC voltage, making sure Black Lead from Meter is on N/L2/2, Red Lead is on S/3.
This is very important to do as stated, if not followed the flow chart will not point you in the
proper direction.
If your meter defaults to an Auto Ranging Scale, change to Manual before proceeding, press your
meter’s Range button to select an appropriate scale.
All Models
Indoor Outdoor Unit Communication Error E1 (page 1 of 3)
Continued on next page

All Models
Indoor Outdoor Unit Communication Error E1 (page 2 of 3)
Note: Terminals may be referred to in one of three ways.
L, N, S Or L1, L2, S Or 1, 2, 3
Go to ODU and Measure the DC
voltage between “N/L2/2” and “S/3”
Black Lead to N/L2/2, Red Lead to S/3
Follow the “1st Steps for DLS Troubleshooting” in the beginning of this guide,
if E1 is displayed, procedure below.
Under normal operation voltage will alternate from approximately -50 Volts to +50 Volts.
If your meter has a MIN/MAX setting, we recommend using this. It can quickly show you the
top and bottom of the alternating range.
Replace Indoor PCB.
Check the wiring connection
from indoor terminal to indoor
PCB. Are they OK?
No
The value is always positive.
The value is fixed and close to 0.
The value is alternative from negative to positive.
Check the wiring connection from outdoor terminal to outdoor
PCB and wiring between PCB’s if there is more than 1 PCB
For ODU’s with 2 PCB’s,
main and IPM (Inverter).
For ODU’s with only 1 PCB
Continued on next page

If after parts
replacement, E1 is still
displayed, contact your
local CE Technical
Support Rep.
No
All Models
No
Yes
Check the AC voltage of L, N
output to IPM board. Is it the
same as the power input?
Unplug all the high voltage
components connected to main
PCB (4 way valve, heater(s), fan)
one by one to check their
resistance. Has any component
short circuited or open?
Replace the IPM board.
Replace the main PCB Unplug all the high voltage
components connected to the
main PCB (4-way valve, heater,
AC fan) one by one to check
their resistance. Has any
component short circuit?
Replace the electronic expansion
valve coil & Main PCB
For some models, outdoor PCB cannot be removed separately. In
these cases, the entire outdoor electric control box should be
replaced as a whole. Parts breakdown shows this information.
Yes
Replace short
circuited
component and
main PCB.
No
Indoor Outdoor Unit Communication Error E1 (page 3 of 3)
Yes
No
Yes No
Replace the short
circuited component
and the main PCB. Yes
Unplug the electronic expansion
valve. Repower ODU, Check if
the power LED is on.
Unplug the electronic expansion
valve. Repower ODU, Check if
the power LED is on.
Replace the main PCB
Check the wiring connection from outdoor terminal to outdoor
PCB and wiring between PCB’s if there is more than 1 PCB
For ODU’s with 2 PCB’s,
main and IPM (Inverter).
For ODU’s with only 1 PCB
Check that the
power LED is on.
No

Error Code
EE
–Water Level Switch Activated
Indoor Unit or Wired Control Display
EE
Dr. Smart Display (Debugger)
No
Error Displayed
Malfunction decision conditions
If the sampling voltage is not 5V
Supposed Causes
• Drain
clogged
• Water level
switch stuck/bad
• Water pump faulty
• Water indoor
unit PCB
Troubleshooting: EE error will lock out the system and display
EE until error is fixed or system restarted
If after parts replacement, error
is still displayed, contact your
local CE Technical Support Rep.
Is there standing water
in drain pan?
No
Yes
No
Is drain line for
clogged?
Yes
Replace PCB Pump
is connected to.
Clear drain and
restart system.
Water Level Alarm EE
Check float switch.
If stuck open, repair or replace.
Does internal or external
drain pump have power to
it during Cooling operation?
CN13 220VAC
YesNo
Replace Pump.
40MBDQ09~58--3 Ducted
Follow the “1st Steps for DLS Troubleshooting”
in the beginning of this guide, if you have an
active error, procedure below.