3064816_201804
93
40. Troubleshooting
Fault
code
Fault
Possible causes
Remedy
52
Max. cylinder heating
time
Cylinder heating takes longer than
permitted.
Check DHW sensor (cylinder sensor) and
sensor lead.
Check cylinder increase HG25 parameter.
Press reset button.
Check primary pump.
53
IO control deviation
Gas valve faulty
Gas supply pressure outside set range
Ionisation electrode corroded/bent
Current controller on GBC-e faulty
Gas valve power supply faulty
Burner earthing faulty
Gas valve:
- Check cables, plugs, power supply and
switching.
Gas pressure:
- Check gas supply pressure (flow pressure);
if OK:
Ionisation electrode:
- Check the condition of the electrode; clean
or replace if necessary.
- Adjust gap and position or replace if neces-
sary.
Press reset button.
Set HG43 IO default value and HG44 KL
offset to factory setting (must be done by
contractor).
54
GLV actuators
Flue gas recirculation
Incorrect gas type setting
Incorrect gas restrictor
Gas valve faulty
Fan faulty
Flue gas recirculation:
- Check flue path inside and outside the
appliance (leaking, blocked).
- Check wind effect.
Gas type setting
- Check gas type setting on the gas valve
and the AM/BM-2.
Gas restrictor:
- Remove the gas valve retainer.
- Check that the correct gas restrictor is
fitted.
CGB-2-20/24: blue
CGB-2-14: black
Gas valve:
- Check cables, plugs, power supply and
switching; if valves are faulty, replace as
necessary.
Fan:
- Check for bearing damage.
- Check cables, plug-in connections, power
supply and switching.
- Replace fan if faulty.
55
GLV system error
Internal plausibility check of GBC-e
failed.
System error:
- Check for a strong electromagnetic field
nearby.
- Switch power ON/OFF; reset if necessary.
Press reset button.
