Troubleshooting Combi Gas Heater Guide (H)
FAULT CODE CAUSE REMEDY
W 255 H
Heater has no 12V power supply
Ensure that the 12V power supply
is available
No connection between heater and
control panel
Make connection between heater
and control panel
W 302 H
W 418 H
Low voltage. Battery voltage is too
low < 10.0V
Charge battery. If necessary,
replace old battery
W 303 H
W 411 H
Risk of low voltage. Battery voltage is
too low < 10.4V
Charge battery
W 401 H
Summer mode with empty
water container
Switch heater off and allow it to cool.
Fill boiler with water
W 402 H
Warm air temperature exceeded:
Not all warm air ducts are connected
Check whether the 4 warm air ducts
are connected
Warm air outlets blocked Check the individual outlet openings
Circulated air intake blocked
Remove the circulated air
intake blockage
W 407 H
No 230V operating voltage Restore 230V operating voltage
230V fuse defective
Replace 230V fuse
(see Combi operating instructions)
W 408 H
No gas supply in Mix mode
Check gas supply.
See fault # 507 (electronic heating
continues in Mix mode)
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