Operating- and Installation Instructions Hans Wilms GmbH & Co. KG
Gas Heaters Model Series GH 40 TH / GH 55 TH / GH 75 TH / GH 105 TH
13.
Possible faults and causes
Fault:
Cause:
Remedy:
Heater does not start
No room thermostat
connected or jumper on
the thermostat socket
is missing
Room thermostat set incorrectly
Connect the room thermostat
or insert jumper
Check setting
Heater starts, flame lights but solenoid
valve does not open….malfunction
Safety thermostat has triggered
or is defective
Burner control or solenoid valve
defective
Cool down the heater,
eliminate the cause, or
replace the STL
Exchange
Heater starts, no flame,
solenoid valve opens, gas flows
......malfunction
Ignition electrode defective
Ignition gap too large
Ignition cable defective
Exchange
Minimize
Exchange
Heater starts, flame lights, solenoid
valve opens, gas flows and
ignites ..........
after few seconds….malfunction
Burner control deefective
Ionization-/ Ignition electrode are
dirty or defective
Protective earth/ground are
missing
Exchange
Clean resp. exchange
Check socket / extension /
power supply to proper ground
Heater starts, flame lights, solenoid
valve opens, no gas flows…...
malfunction
Hose leakage device not pressed
Gas pressure regulator defective
Gas pressure too low
Valve clogged
Solenoid valve or gas pipe
clogged
Press after opening the bottle
valve
Exchange
Check
Clean resp. exchange
Clean resp. blow through
(customer service)
Heater sometimes switches to
malfunction
Ionization-/ Ignition electrode are
dirty or defective
Ignition
Control box
Gas pressure
Check
Check
Check for loose clips
Check
45 of 62
Operating- and Installation Instructions Hans Wilms GmbH & Co. KG
Gas Heaters Model Series GH 40 TH / GH 55 TH / GH 75 TH / GH 105 TH
13.
Possible faults and causes
Fault:
Cause:
Remedy:
Heater does not start
No room thermostat
connected or jumper on
the thermostat socket
is missing
Room thermostat set incorrectly
Connect the room thermostat
or insert jumper
Check setting
Heater starts, flame lights but solenoid
valve does not open….malfunction
Safety thermostat has triggered
or is defective
Burner control or solenoid valve
defective
Cool down the heater,
eliminate the cause, or
replace the STL
Exchange
Heater starts, no flame,
solenoid valve opens, gas flows
......malfunction
Ignition electrode defective
Ignition gap too large
Ignition cable defective
Exchange
Minimize
Exchange
Heater starts, flame lights, solenoid
valve opens, gas flows and
ignites ..........
after few seconds….malfunction
Burner control deefective
Ionization-/ Ignition electrode are
dirty or defective
Protective earth/ground are
missing
Exchange
Clean resp. exchange
Check socket / extension /
power supply to proper ground
Heater starts, flame lights, solenoid
valve opens, no gas flows…...
malfunction
Hose leakage device not pressed
Gas pressure regulator defective
Gas pressure too low
Valve clogged
Solenoid valve or gas pipe
clogged
Press after opening the bottle
valve
Exchange
Check
Clean resp. exchange
Clean resp. blow through
(customer service)
Heater sometimes switches to
malfunction
Ionization-/ Ignition electrode are
dirty or defective
Ignition
Control box
Gas pressure
Check
Check
Check for loose clips
Check
45 of 62
Operating- and Installation Instructions Hans Wilms GmbH & Co. KG
Gas Heaters Model Series GH 40 TH / GH 55 TH / GH 75 TH / GH 105 TH
13.
Possible faults and causes
Fault:
Cause:
Remedy:
Heater does not start
No room thermostat
connected or jumper on
the thermostat socket
is missing
Room thermostat set incorrectly
Connect the room thermostat
or insert jumper
Check setting
Heater starts, flame lights but solenoid
valve does not open….malfunction
Safety thermostat has triggered
or is defective
Burner control or solenoid valve
defective
Cool down the heater,
eliminate the cause, or
replace the STL
Exchange
Heater starts, no flame,
solenoid valve opens, gas flows
......malfunction
Ignition electrode defective
Ignition gap too large
Ignition cable defective
Exchange
Minimize
Exchange
Heater starts, flame lights, solenoid
valve opens, gas flows and
ignites ..........
after few seconds….malfunction
Burner control deefective
Ionization-/ Ignition electrode are
dirty or defective
Protective earth/ground are
missing
Exchange
Clean resp. exchange
Check socket / extension /
power supply to proper ground
Heater starts, flame lights, solenoid
valve opens, no gas flows…...
malfunction
Hose leakage device not pressed
Gas pressure regulator defective
Gas pressure too low
Valve clogged
Solenoid valve or gas pipe
clogged
Press after opening the bottle
valve
Exchange
Check
Clean resp. exchange
Clean resp. blow through
(customer service)
Heater sometimes switches to
malfunction
Ionization-/ Ignition electrode are
dirty or defective
Ignition
Control box
Gas pressure
Check
Check
Check for loose clips
Check
45 of 62