Diagnostics
52
8
Code
Description
Warning (u)
Error (E)
420
Generator temperature probe
fault
NA
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
424
Flue gas temperature probe
fault
Reset is automatic up to 5 attempts.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
425
Clogged condensate drain
NA
Check and clean condensate discharge.
Reset is automatic when the triggering condition ceases.
It is also possible to make the reset following one of procedures
shown in Paragraph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
426
Generator fins temperature
probe fault
Reset is automatic up to 5 attempts.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
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.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
435
Gas valve temperature probe
fault
Reset is automatic when the the functioning
probe is restored.
NA
436
Blower fault
Reset occurs automatically 20 minutes after the
code is generated.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
438
Internal flame controller error
Reset occurs automatically 10 seconds after the
code is generated.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
439
Fan fault
The system tries to resolve the fault once; if not
successful, warning 461 is generated.
NA
441
Parasitic flame lockout
NA
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
442
Flame loss
Reset occurs automatically 10 seconds after the
code is generated.
NA
443
Flame controller communica-
tion error
Reset is automatic when the triggering condi-
tion ceases.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
444
Evaporator temperature probe
fault
NA
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code persists, shows up again or in case of doubt, contact the
TAC.
446
High hot water inlet tempe-
rature
Check configuration of other heat generators on
the system.
Ensure the secondary circuit pump is working.
Ensure the exchange terminals are active.
Check any bypasses between outlet and inlet.
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 is automatic when the triggering condition ceases.
If the code shows up again or in case of doubt contact the TAC.
448
High hot water differential
temperature
Check cleanliness of water filters.
Check water flow.
Reset occurs automatically 20 minutes after the
code is generated.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
If the code shows up again or in case of doubt contact the TAC.
449
Missing additional board
NA
Contact the TAC.
450
Found additional board
NA
Contact the TAC.
460
Defrosting valve has failed to
open
Non-blocking event.
Reset is automatic, however, it is advisable to
contact the TAC.
The reset may be done following one of procedures shown in Para-
graph 6.7.3
Contact the TAC.
