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 to signify that one of the following
3 components has been triggered:
Tab.69
Component responsible Steps to be performed
Safety thermostat on the combustion
chamber door
Switch off and power off the boiler.
Use an ohmmeter to check whether the component is triggered.
In normal operation, the ohmmeter displays 0 Ω (circuit normally closed)
If the safety thermostat on the combustion chamber door has been triggered:
Remove the burner,
Replace the insulation on the combustion chamber door,
Use the tip of a pen to perform a manual reset.
Water safety thermostat Wait for the water temperature to drop.
Clear the error using the main button.
Exchanger thermofuse Switch off and power off the boiler.
Use an ohmmeter to check whether the component is triggered.
In normal operation, the ohmmeter displays 0 Ω (circuit normally closed)
If the exchanger thermofuse has been triggered:
Remove the heat exchanger,
Replace the insulation behind the burner bracket,
Replace the safety thermostat thermofuse behind the heat exchanger.
12 Troubleshooting
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