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Fault code chart
Code Error
01
Ignition failure
02
Gas valve relay/T max.
03
Gas valve
10
Sensor diff too high
23
Filters/system fan
25
T max.
31
Too many attempts to restart Flame goes out (3x) when the device is in operation.
42
Choke relay broken
43
Combustion air fan failure
62
Block drain
65
Phase and zero back to front Phase and zero not connected correctly
72
Air out sensor open
73
Unit temp sensor open
78
Air out safety open
80
Air out shorted
81
Unit temp shorted
86
Air out safety shorted
When a different error code displayed on the thermostat appears, press the Reset button. If the fault
returns, please contact the vendor of the device.
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.
22
Description
Ignition has failed (three attempts at ignition).
Maximum thermostat is open
Gas valve faulty / Wire connecting the gas valve to the
burner control box is open-circuit or has been incor-
rectly connected.
Temperature difference between both outlet tempera-
ture sensors is too high.
Filter is dirty/system fan has suffered a thermal failure
Maximum thermostat is open
Relay of the choke valve is broken
The current speed of the combustion air fan deviates too
much
Condensate drain blocked (type GS+ 135/150)
Outlet temperature sensor interrupted
Ambient temperature sensor interrupted
Outlet temperature sensor interrupted
Outlet temperature sensor has short circuited
Ambient temperature sensor has short circuited
Outlet temperature sensor has short circuited
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