Wolf MGK-2-390 Installation Instructions Manual page 62

Fault
The following faults are in the system:
Fault Fault
code
1 HLSC excess temp.
2 TL excess temp.
3 eHLSC drift
4 No flame
5 Flame failure
6 TC excess temp.
7 TL flue excess temp.
8 Flue gas damper does not
switch
9 Fault code unknown
10 eHLSC sensor faulty
11 Flame pretence
12 Boiler sensor faulty
13 FlueG sensor faulty
14 DHW sensor faulty
15 Outside temperature sensor
faulty
16 Rtn sensor faulty
18 Ext. safety circuit
20 GCV relay test
24 Fan speed <
62
35. Troubleshooting
Cause
The high limit safety cut-out (thermostat) has
responded
The boiler water temperature has exceeded
107 °C
One of the temperature sensors eHLSC1 or
eHLSC2 has exceeded the high limit safety
cut-out limit (105 °C)
Temperature difference between temperature
sensors eHLSC1 and eHLSC2 > 6 °C
At burner start, no flame at the end of the
safety time, monitoring electrode faulty,
ignition electrode faulty, ignition transformer
faulty
Flame failure during operation, monitoring
electrode faulty, flue gas path blocked,
condensate drain blocked
One of the temperature sensors eHLSC1
or eHLSC2 has exceeded the limit of the
temperature limiter (97 °C)
The flue gas temperature has exceeded the
limit of the TBA shutdown temperature
Flue gas damper contact (E1) closes or does
not open on demand; output A1 does not
activate flue gas damper
This fault is not known in this software
Temperature sensor eHLSC1, eHLSC2 or
sensor lead has short circuit or break
A flame is recognised before the burner starts Press reset, test monitoring
Boiler sensor > 105 °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
Outside temperature sensor or sensor lead
has short circuit or break
Return sensor or sensor lead has short circuit
or break
The contact for the external safety circuit has
responded (maximum pressure limiter, low
water indicator, etc.)
The internal relay test failed
The fan does not reach the set speed
Remedy
Test heating circuit pump, vent
system, press reset, clean heat
exchanger
Test heating circuit pump, test
sensors, vent system, press reset,
clean heat exchanger
Test sensors, test heating circuit
pump, vent system, press reset,
clean heat exchanger
Test monitoring electrode, ignition
electrode and ignition transformer,
press reset, check gas pressure
Test monitoring electrode, press
reset, test flue system, test
condensate drain
Test heating circuit pump, vent
system, test sensors, press reset,
clean heat exchanger
Clean heat exchanger, test sensors,
check flue system
Check flue gas damper and wiring,
check settings HG13 and HG14
Check software version of the PCBs
Check sensor and lead
electrode
Check sensor and lead
Check sensor and lead
Check sensor and lead
Check sensor and lead
Check sensor and lead
Press reset, repair fault
Press reset, replace burner control
unit
Test the fan's PWM and power
cable, test fan, press reset
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