Wolf CGB-2 Series Installation Instructions For Contractors page 92

Fault Fault
code
12 Boiler sensor faulty
13 Flue gas sensor faulty
14 DHW sensor faulty
15 Outside sensor faulty
16 Return sensor faulty
20 GCV relay test
24 Fan speed <
26 Fan speed >
27 DHW outlet sensor faulty
Stratification sensor
faulty
92
41. Troubleshooting
Possible causes
Excess temperature in the flow
Boiler sensor > 100 °C
Boiler sensor or sensor lead has short
circuit or break
Flue gas sensor or sensor lead has
short circuit or break
DHW sensor (cylinder sensor) or sensor
lead has short circuit or break
DHW-sensor > 99 °C
Outside sensor or sensor lead has short
circuit or break
eBus - Outside temperature sensor
Funk - Outside temperature sensor
Return sensor or sensor lead has short
circuit or break
Return sensor > 100 °C
Valve test failed
Gas valve faulty
Set fan speed is not achieved
Control unit casing not engaged
Fan faulty
F2 fuse defective on HCM-2
The fan does not stop
DHW outlet sensor faulty / stratification
sensor or sensor lead has a short circuit
or lead break
Remedy
Pump:
- Check if pump is running. If not, check
cables and plugs. If electrical connection
OK and no function, replace pump.
Excess flow temperature:
- Increase the minimum pump speed.
Boiler sensor:
- Check leads and plug-in connections.
- If OK and no function, replace the boiler
sensor.
Press reset button.
Flue gas temperature sensor:
- Check leads and plug-in connections.
- If electrical connection OK and no func-
tion: Replace the sensor.
Press reset button.
DHW temperature sensor:
- Check leads and plug-in connections.
- If OK, replace sensor.
Press reset button.
eBus - Outside temperature sensor:
- See instructions for eBUS outside sensor.
Wireless outside sensor
- See instructions for wireless outside sen-
sor.
Press reset button.
Return sensor:
- Check leads and plug-in connections.
- If OK and no function, replace the return
sensor.
Press reset button.
Replace gas valve.
Press reset button.
Fan:
- Check cables, plug-in connections, power
supply and switching.
- If OK and no function: Replace the fan.
Control unit casing not engaged
- Check that control unit top and bottom
casings are engaged.
Check F2 fuse on HCM-2 control PCB
Press reset button.
Fan:
- Check cables, plug-in connections, power
supply and switching.
- If the fault occurs repeatedly, replace fan.
Press reset button.
DHW outlet sensor / stratification sensor:
- Check cables and plug-in connections.
- If OK and no function, replace the sensor.
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