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Display
Description of the error
128
128:Loss of flame in op
Flame extinguished.
130
130:Flue gas temp too high
Cut-off by flue gas sensor for overheating.
133
133:Safety time exceeded
Ignition error (4 attempts).
151
151:BMU internal
Internal error on heating PCB.
152
152:Parameterization
General parameter setting error.
153
153:Unit locked
Appliance locked manually.
160
160:Fan speed threshold
Fan operation error.
162
162:Air pressure switch
Flue gas pressure switch tripped
171
171:Alarm contact 1 active
ACI board error.
178
178:Limit thermostat CH1
Safety thermostat CH1.
179
179:Limit thermostat CH2
Safety thermostat CH2.
321
321:HW outlet sensor
Domestic hot water sensor damaged.
343
343:Solar integration missing
General parameter setting error on the solar system (if incorporating a so
lar system).
353
353:Casc sens B10 missing
B10 cascade sensor missing.
372
372:Limit thermostat CH3
Safety thermostat CH3.
373
373:Extension module 3
Extension module 3.
384
384:Extraneous ligth
Light incorrect (parasite flame — internal anomaly).
385
385:Mains undervoltage
Power supply voltage too low.
386
386:Fan speed tolerance
Fan threshold speed not reached.
430
430:Dyn water pres too low
Safety cut-off for absence of circulation (check made by a pressure sen
sor).
432
432:Function ground missing
Earthing function not connected.
E110
110:Lockout SLT
The code E110 is displayed when overheating occurs due to a breach in
the insulation:
Remove the heat exchanger.
Replace the insulation behind the burner bracket.
Replace the safety thermofuse behind the heat exchanger.
Important
This list is not exhaustive. Other error codes may be displayed.
Contact the accredited technical support service.
Error 110:Lockout SLT
The code 110:Lockout SLT is displayed when overheating occurs due to a
breach in the insulation:
1. Remove the heat exchanger.
2. Replace the insulation behind the burner bracket.
3. Replace the safety thermofuse behind the heat exchanger.
Error 162:Air pressure switch
The error 162:Air pressure switch signifies that the flue gas differential
pressure switch has been triggered several times over the last 24 hours.
Check that the air inlet and combustion products discharge pipes are not
blocked. Unblock these if necessary.
After this procedure, proceed as follows to restart the boiler:
12 Troubleshooting
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