Diagnostics
Installation, use and maintenance manual – GAHP A
35
8
Code
Description
Warning (u)
Error (E)
423
Air-gas mix temperature probe fault
NA
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
424
Flue gas temperature probe fault
Reset is automatic when the triggering condi-
tion ceases.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
425
Clogged condensate drain
NA
Check and clean condensate drain.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
426
Generator fins temperature probe
fault
Reset is automatic when the triggering condi-
tion ceases.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
428
Flame controller error
NA
Power off the appliance.
Contact the TAC.
429
Gas solenoid valve without electrical
power
Reset occurs automatically if the gas solenoid
valve switches on again within 10 minutes (with
central flame control unit on).
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
430
High flue gas or generator fins
temperature
Reset is automatic when the triggering condi-
tion ceases.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
431
Hot water temperature exceeding
operational limits
Check configuration of other heat generators on
the system.
Check water flow.
Check system thermal load.
Reset is automatic when the triggering condi-
tion ceases.
NA
434
-
Contact the TAC.
NA
436
Blower fault
Reset occurs automatically 20 minutes after the
code is generated.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
437
Low air-gas mix temperature
Non-blocking Warning (informative code).
The code is reset automatically when the
triggering condition ceases.
NA
444
Evaporator temperature probe fault
NA
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
446
High hot water inlet temperature
Check configuration of other heat generators on
the system.
Reset is automatic and occurs if the generating
condition ceases with circulating pump on or
20 minutes after the code is generated with
circulating pump off.
NA
447
Hot water inlet temperature below
operational limits
Reset occurs automatically when the generating
cause resolves or 430 seconds after the code is
generated.
Reset occurs automatically when the condition that generated
the code ceases.
If the code shows up again or in case of doubt contact the TAC.
448
High hot water differential temper-
ature
Check water flow.
Reset occurs automatically 20 minutes after the
code is generated.
Reset occurs automatically when the condition that generated
the code ceases.
If the code shows up again or in case of doubt contact the TAC.
449
Missing auxiliary board
NA
Contact the TAC.
452
Defrosting cycle activated
Non-blocking Warning (informative code).
The code clears automatically when execution
of defrosting ends.
NA
453
Water flow while system in cooling
mode
Reset is automatic when the triggering condi-
tion ceases.
NA
460
Defrosting valve has failed to open
Non-blocking Warning (informative code).
Reset is automatic, however, it is advisable to
contact the TAC.
Reset may be performed from the DDC/CCI or from the S61
board (menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
461
Oil pump priming cycle activated
The priming cycle lasts 30’ if activated manually
or 10 minutes if activated automatically.
Reset is automatic when the triggering condi-
tion ceases.
NA
Summary of Contents for GAHP A indoor
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