14
7.0 Fault codes
Code Error Description
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 incorrectly
connected.
10 Sensor diff too high
Temperature difference between both outlet temperature
sensors is too high.
23 Filters/system fan Filter is dirty/system fan has suffered a thermal failure
25 T max. Maximum thermostat is open
31 Too many attempts to restart Flame goes out (3x) when the device is in operation.
42 Choke relay broken Relay of the choke valve is broken
43 Combustion air fan failure
The current speed of the combustion air fan deviates too
much
62 Block drain Condensate drain blocked. Condensate pump failure.
65 Phase and zero back to front Phase and zero not connected correctly
72 Air out sensor open Outlet temperature sensor interrupted
73 Unit temp sensor open Ambient temperature sensor interrupted
78 Air out safety open Outlet temperature sensor interrupted
80 Air out shorted Outlet temperature sensor has short circuited
81 Unit temp shorted Ambient temperature sensor has short circuited
86 Air out safety shorted Outlet temperature sensor has short circuited
When a different error code displayed on the thermostat appears, press the Reset button. If the fault re-
turns, please contact the vendor of the device.
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