Diagnostics
42
8
684
Transformer or 24 Vac fuse fault
NA
Contact the TAC.
685
Invalid module type configuration
parameters
NA
Contact the TAC.
686
ROM board fault
NA
Contact the TAC.
687
pRAM board fault
NA
Contact the TAC.
688
xRAM board fault
NA
Contact the TAC.
689
Registers board fault
NA
Contact the TAC.
690
Outdoor temperature probe fault
NA
Reset may be performed from the DDC or from the S61 board (menu
2, parameter 1).
If the code persists, shows up again or in case of doubt, contact the
TAC.
691
Electronic board fault
NA
Contact the TAC.
NA: Not Applicable
Table 8.2
Operative Codes AY00-120
Code
Description
Warning (u)
Error (E)
100
Flame controller reset circuit fault
NA
Power cycle the appliance.
If the code persists, shows up again or in case of doubt, contact
the TAC.
101
Limit thermostat trip
Contact authorised Technical Assistance
102
Flue gas thermostat trip
Contact authorised Technical Assistance
103
Missing S70 board
NA
Contact authorised Technical Assistance
105
Outdoor temperature exceeding
operational limits
NA
Reset is automatic when the triggering condition ceases.
106
Outdoor temperature below opera-
tional limits
Non-blocking Warning (informative code).
The code is reset automatically when the
triggering condition ceases.
NA
107
Hot water flow while system in
cooling mode
Reset is automatic when the triggering condi-
tion ceases.
NA
112
Flame controller lockout
Reset is automatic up to 4 attempts (in about 5
minutes).
Check gas supply.
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 20).
If the code persists or in case of doubt, contact the TAC.
127
Internal appliance circuit low water
flow
Reset is automatic when the triggering condi-
tion ceases.
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists or in case of doubt, contact the TAC.
128
Flame controller error
NA
Power off the appliance.
Contact the TAC.
129
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 or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
135
Internal appliance circuit delivery
water temperature probe fault
NA
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
136
Blower fault
Reset occurs automatically 20 minutes after the
code is generated.
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
175
Low hot water flow
Reset is automatic when the triggering condi-
tion ceases.
Check and clean water filters on the system.
Check for air in the system.
Check water flow pump.
Power cycle the appliance.
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
176
Hot water delivery temperature probe
fault
NA
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
177
Hot water inlet temperature probe
fault
NA
Reset may be performed from the DDC or from the AY10 board
(menu 2, parameter 21).
If the code persists, shows up again or in case of doubt, contact
the TAC.
178
High hot water delivery temperature
Reset is automatic when the triggering condi-
tion ceases.
NA
179
Heating antifreeze function activated
Non-blocking Warning (informative code).
The code clears automatically when antifreeze
function execution ends.
NA
