Troubleshooting - Wolf MGK-130 Technical Manual And Installation Instructions

Any faults will be displayed as fault codes by Wolf controllers with eBUS capability. Cause and remedy may be
allocated to these faults using the following table. This table is designed to allow your local heating contractor to trace
the fault more easily.
Fault Fault
code
1 TBV excess
temperature,
water pressure too low
4 No flame builds
5 Flame failure during
operation
6 TW excess
temperature
7 TBA excess
temperature,
overpressure in the
flue gas system
11 Flame pretence
12 Faulty flow sensor, gas
pressure too low
14 Cylinder sensor faulty
15 Outside temperature
sensor faulty
16 Return sensor faulty
20 Fault, gas valve "1"
21 Fault, gas valve "2"
24 Gas fan fault
25 Gas fan fault
26 Gas fan fault
30 CRC fault, gas
condensing boiler
31 CRC fault burner
32 24 V AC supply faulty
33 CRC fault; default
values
40 Flow monitoring
41 Flow monitoring
60 Ionisation current
fluctuates
61 Ionisation current fails
LED constantly red
3062880_0910

Troubleshooting

Cause
The flow temperature has exceeded the limit
for the TBV shutdown temperature, or the
condensate lifting pump (accessory) has
developed a fault or the water pressure switch
switches off at a pressure < 1.0 bar
No flame builds during burner start
Flame failure within 15 s after flame detection
The flow/return temperature has exceeded the
limit for the TW shutdown temperature
The flue gas temperature has exceeded the
limit for the TBA shutdown temperature, flue gas
system is blocked, ventilation air is blocked
A flame is recognised before the burner starts
The flow temperature sensor or lead is faulty.
Gas pressure < than the value set at the gas
pressure switch (only displayed after 15 min)
DHW temperature sensor or lead faulty
The outside temperature sensor or cable is faulty
The return temperature sensor or lead is faulty
A flame is detected for 15 s after burner
operation, even though gas valve 1 has received
a shutdown command
A flame is detected for 15 s after burner
operation, even though gas valve 2 has received
a shutdown command
The gas fan does not reach the required pre-
purging speed
The gas fan does not reach the ignition speed
The gas fan does not stop
The EEPROM record "Gas condensing boiler" is
invalid
The EEPROM record "Burner" is invalid
24 V AC supply outside the permissible range
(e.g. short circuit)
The EEPROM record "Master reset" is invalid
The flow limiter does not switch OFF or ON
Return temperature > Flow + 25 K
The siphon is blocked, or the flue gas system is
blocked, severe storm
Poor gas quality, monitoring electrode faulty,
severe storm
Ionisation cable shorted out or ionisation
electrode earthed (casing)
Remedy
Check the system pressure. Check the heating
circuit pump. Vent the system. Press the reset
button
Check the condensate pump
Increase system pressure
Check the gas supply line and open the gas valve,
if necessary
Check the ignition electrode and ignition cable.
Press reset
Check CO values. Check ionisation electrode and
2
cable. Press the reset button
Check the system pressure. Vent the system.
Set the pump to stage 2 or 3
Clean the heat exchanger, check the flue gas
system
Check ventilation air system
Press the reset button
Check lead
Check the flow sensor
Check gas pressure
Check the gas pressure switch settings
Check sensor and lead
Check lead
Check the outside temperature sensor
Check lead
Replace the return sensor
Replace the gas combination valve
Replace the gas combination valve
Check the gas fan supply cable and the gas fan;
press the reset button
Check the gas fan supply cable and the gas fan;
press the reset button
Check the gas fan supply cable and the gas fan;
press the reset button
Switch the power supply OFF and ON.
If unsuccessful, replace the control PCB
Switch the power supply OFF and ON.
If unsuccessful, replace the control PCB
Check the gas fan
Replace the control PCB
Check flow switch
Check connection E1
Vent the heating system, check the system
pressure. Check the heating circuit pump
Clean siphon, check flue gas system, check
ventilation air, check monitoring electrode
Check monitoring electrode and lead
Check ionisation cable and position of electrode to
burner. Press the reset button
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