13
warmhaus.co.uk
Error
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 failure
> 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 all
3) Check all radiator valves are open if they are closed. Minimum
3 meters of radiator must be open
4) RESET boiler and check if problem resolved
5) Call for authorised service
E 28
Maximum allowed consecutive
lock-out reset reached
Usable RESET number
reached.
Too many consecutive lock-out
failures (followed by reset) due
to other possible causes
1) Turn OFF the power of the appliance. Reset will be allowed
after turning ON the power.
2) Check the root cause of Error 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 during
normal operation OR < 182
VAC +/- 5% during Au-TO
calibration mode
1) Call for Electrical supply network provider
2) Error will remove if supply voltage > 170 VAC +/- 5%
3) If this failure is observed 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 of the
electric supply network. Value
out of tolerance, 50 Hz +/- 5%
1) Call for Electrical supply network provider
2) Error will remove if supply frquency 50 Hz +/- 5%
E 41
Loss of flame more than 6
successive times
Boiler does not work, E41 error
code flashing on the screen
> Too many domestic hot
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 authorised service.
E 43
Opentherm Communication
error
Boiler does not work, E43
error code flashing on the
screen after 1 minute of
communication 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 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 requests in short
time
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 old board (PCB)
> Service key damaged or
disconnected
> Updating Software
1) Call For authorised 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 in
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 of exhaust gas
into fresh air
> Blockage in flue or wrong
flue
> Electrode position
> Cabling disconnections
> Combustion calibration
> Electronic board
> Gas valve failure
1) Call for authorised service
E 78
Max regulation current value
reached
Boiler does not work, E78 error
code flashing on the screen
> Gas inlet pressure
> Aging or rust on the
electrode
> Recirculation of exhaust gas
into fresh air
> Blockage in flue or wrong
flue
> Electrode position
> Cabling disconnections
> Combustion calibration
> Electronic board
> Gas valve failure
1) Call for authorised service
