Part number 550-100-305/0916
75
AquaBalance
TM
W
ALL
M
OUNT
GAS
-
FIRED
WATER
BOILER
— C
OMBI
Boiler Manual
32
Troubleshooting
(continued)
Figure 96
4ROUBLESHOOTINGSUGGESTIONS
&AULTDISPLAYSANDDIAGNOSTICS
(continued)
Fault
Code Fault
Potential cause
Correction
F13
Exhaust probe fault
Probe damaged
Check the wiring or replace the exhaust
probe.
Wiring shorted
Wiring disconnected
F14
Supply sensor 2 fault
Sensor damaged
Check the wiring or replace the CH sensor.
Wiring shorted
Wiring disconnected
F15
Blower fault
No 120V power supply
Check the 8-pin connector wiring.
Tachometric signal interrupted
Check the 8-pin connector wiring.
Blower damaged
Check the fan.
Condensate trap blocked
Check the condensate trap and clean it if
necessary.
Also inspect gas valve, blower, venturi, igniter,
and heat exchanger, and replace those with
signs of damage.
F27
Flue temp
Exhaust gas temp too high
Make sure correct vent material was
selected (Parameter List 165).
F34
Supply voltage under 100V
Electric voltage trouble
Check the electrical system.
F35
Faulty voltage frequency
Electric voltage trouble
Check the electrical system.
F37
Incorrect system water
pressure
*
Pressure too low < 8 psi
Fill the system.
Water pressure switch damaged or not
connected
Check the sensor.
F39
Outdoor sensor fault
Sensor damaged or wiring shorted
Check the wiring or replace the sensor.
Sensor disconnected after activating the
sliding temperature
Reconnect the outdoor sensor or disable the
sliding temperature.
A16
Outdoor sensor fault
Outdoor sensor is not connected
Check the sensor.
A26
System installation
F40 Error repeated 3 times in 1 hour
Check the water pressure in the system.
A41
Sensor positioning
Supply sensor disconnected from pipe
Check the correct positioning and operation
of the heating sensor.
A42
Heating sensor fault
Sensor damaged
Replace the sensor.
A44
Temp sensor
Te m p s e n s o r n o t c o n n e c t e d o r
badly connected to pipe (DHW mode)
Check the sensor.
F43
Exchanger protection acti-
vation.
No system H2O circulation
Check the circulating pump.
Air in the system
Vent the system.
F51
Low water
Low water fault
Check boiler installation and water level.
F52
Heating sensor fault
Sensor damaged
Replace the sensor.
F53
Temp sensor
High limit thermostat error
Check the sensor, check boiler installation.
A61
Controller ABM08 fault
Controller ABM08 internal error
Check the ground connection and replace the
controller if necessary.
A62
No communication between
controller and gas valve
Controller not connected
Connect the controller to the gas valve.
Valve damaged
Replace the valve.
A63
Controller ABM08 fault
Controller ABM08 internal error
Check the ground connection and replace the
controller if necessary.
F64
A65
F66
A23
Control board parameter
fault
Wrong control board parameter setting
Check the Control board parameter and
modify it if necessary.
A24
F20
F21
F40
F47
*
Boiler water pressure switch is set for 9 psi (±2) minimum pressure.