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Fault code chart
Remarks!
Please refer also to the technical documentation for the air heater for information on the above
faults, causes and solutions.
7.0 Disposal of the OptiTherm.
When the OptiTherm is replaced or removed, it must be recycled or destroyed in accordance
with national and/or local legislation and regulations.
Code Meaning Cause
01 Ignition failure Ignition has failed (three attempts at ignition).
02 Gas valve relay/T max. Maximum thermostat is open
03 Gas valve
Gas valve faulty / Wire connecting the gas valve to the
burner control box is open-circuit or has been incor-
rectly connected.
22 Air compression switch The air compression switch is not open
23 Filters/system fan Filter is dirty/system fan has suffered a thermal failure
24 Air compression switc The air compression switch is not off
25 T max. Maximum thermostat is open
31 Too many attempts to restart Flame goes out (3x) when the device is in operation.
65 Phase and zero back to front Phase and zero not connected correctly
73 Ambient temperature sensor Ambient temperature sensor interrupted
76 System sensor System temperature sensor interrupted
81 Ambient temperature sensor Ambient temperature sensor has short circuited
84 System sensor System temperature sensor has short circuited
When a different error code displayed on the thermostat appears, press the Reset button in rst. If the
fault then come back, please contact the vendor of the device.
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