40
warmhaus.com
Error
Code
Description of the
Error
Malfunction
Probable Cause
Solution(s)
E 43
Opentherm
Communication
error
Boiler does not
work, E43 error
code flashing
on the screen
after 1 minute of
communucation
error
Opentherm line
disconnected
1-) Remove energy from boiler and re
energize E43 will be removed and boiler &
buttons will get back to funcitional
2-) Replace the room unit batteries with
the fresh ones and reset from room unit
3-) Check cabling between boiler and room
unit and re connect if any disconnection,
if connection set up succesfully then
connection symbol (Figure 48, symbol 18)
will be activated on the screen
4-) Call for authorised service to re
connect openterm connection
E 44
Cumulated
intermittent
ignition without
reaching
burner ignition.
Boiler does not
work, E44 error
code flashing on the
screen
> Intermittent
contacts on harness
> Hammer effect on
water net
> Too many request
from in shotr
time from out side
room units or
thermosad bridge
etc.
1-) Reset & Restart boiler
2-) Call for authorised service
E 62
Calibration request
Boiler does not
work, E62 error
code flashing on the
screen
> Calibration not
done
> Replacing board
but not service
key from the board
dismantled
> Service key
damaged or
disconnected
> Updating
Software (probable)
1-) Call For service
E 72
Delta T heating
at ignition not
occurred
Boiler does not
work, E72 error
code flashing on the
screen
> FLOW OR
RETURN Sensor
not on
position
1-) Call for authorised service at first
2-) Check RETURN and FLOW sensor on
position.
E 74
Second CH
temperature Probe
faulty
Boiler does not
work, E74 error
code flashing on the
screen
> FLOW and LIMIT
Sensor (double NTC
) faulty
1-) Reset & Restart boiler
2-) Call for authorised service.
E 77
Absolute current
values reached
Boiler does not
work, E77 error
code flashing on the
screen
> Gas inlet pressure
> Aging or rust on
the electrode
> Recirculation on
fluegas path
> Blokage on flue or
wrong flue
> Electrode position
> Cabling
disconnections
> Combustion
calibration
> Electronic board
> Gas valve failure
1-) Call for authorised service at first
