23
warmhaus.com
Failure
Code
Description of the Error
Malfunction
Probable Cause
Solution(s)
E 21
Delta Temperature Central
Heating flow and Return >
TSP 82 value °C
Boiler does not work, E21
error code flashing on the
screen
> Lack of water on the system
> Pump blockage
> Pump failiure
> Pump harness
> Installation blockage
1-) RESET boiler at first check if problem removed
2-) Check boiler central heating valves are open if they are closed open
of all
3-) Check all radiator valves are open if they are closed open of all
minimum 3 meters of radiator must be open
4-) RESET boiler and check if problem removed
5-) Call for authorised service at first
E 28
Maximum allowed consecu-
tive lock-out reset reached
Usable RESET number
reached.
Too many consecutive
lock-out failures (followed by
reset) due to other possible
causes
1-) Removing power supply reset will be allowed
2-) Check the root cause of Error code to solve
3-) If fault still persists call for authorised service
E 37
Low voltage anomaly
Boiler does not work, E37
error code flashing on the
screen
Low voltage < 165 VAC +/-
5% on the supply network
operation mode
OR
During Au-TO calibration
mode < 182 VAC +/- 5%
1-) Call for Electrical supply network provider
2-) Error will remove if supply voltage > 170 VAC +/- 5%
3-) If you seen seen this E37 during calibration calibration can not be
complete unless supply voltage > 188 VAC +/- 5%
E 40
Wrong network frequency
survey
Boiler does not work, E40
error code flashing on the
screen
Wrong frequency survey out
of tolererance 50 Hz +/- 5%
on the supply net work
1-) Call for Electrical supply network provider
2-) Error will remove if supply frquency 50 Hz +/- 5%
E 41
Loose of flame more than 6
successive times
Boiler does not work, E41
error code flashing on the
screen
> Too many domestic heat
water request in short period
( 1 min )
> Low gas pressure
1-) Call for authorised service at first
E 42
Buttons anomaly
Boiler does not work, E42
error code flashing on the
screen
Wrong parameters settled on
TsP menu
1-) Call For service
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 energised 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 cabeling between boiler and room unit and re connect if any
disconnection, if connection set up succesfully then connection symbol
page 37 symbol 19 will be activated on the screen
4-) Call for authorised service to re connect openterm connection
rE 44
Cumulated intermittent igni-
tion 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 at first
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-) Call for authorised service at first
2-) Check CH temperature probe ressistance ( double CH ntc probe is
used as high temperature limit device) according to page 94 at section
4.29 if its out of tolerance replace double NTC
3-) Check cabeling and connectors between double NTC and board
4-) Reset & Restart boiler
