25
warmhaus.com
Failure
Code
Description of the Error
Malfunction
Probable Cause
Solution(s)
E 84
Capacity reduction for
detected (supposed) low gas
inlet pressure
Boiler does not work, E84
error code flashing on the
screen
> Gas inlet pressure
> Combustion problem
1-) If there is strong wind (ie.wind storm) wait until the wind storm stop
then RESET the boiler
2-) IF problem persist Call for authorised service
3-) Check gas supply pressure must be 20-17 mBar. Gas pressure must
be in between on this values while boiler on operational
4-) Check combustion CO2 or O2 values on HI and LO mode at sweep-
er mode according to direction of manual page 67- 70
5-) Perform Auto Calibration according to page 76 or 77, IF combustion
values are out of tolerances measured one step before
Attention: Only authorised service must perform Au-To
calibration
E 87
Problem on electronic gas
valve circuit
Boiler does not work, E87
error code flashing on the
screen
> Cabeling disconnections
> Gas valve failiure
1-) Call for authorised service at first
2-) Check gas valve cabeling between board and gas valve
3-) Measure gas valve coil ressistances according to manual page 92
if gas valve coils out of tolerance, then replace gas valve, and Perform
Au-To calibration according to page 76 or 77
Attention: Only authorised service must perform Au-To
calibration
E 88
Fault of electronic gas valve
managing circuit
Boiler does not work, E88
error code flashing on the
screen
> Cabeling disconnections
> Gas valve failiure
1-) Call for authorised service at first
E 89
Problem on combustion feed-
back signal
Boiler does not work, E89
error code flashing on the
screen
> Aging or rust on the
electrode
> Recirculation on fluegas
path
> Blokage on flue or wrong
flue
> Electrode position
> Cabeling disconnections
> Combustion calibration
> Electronic board
> Gas valve failiure
1-) Call for authorised service at first
E 90
Unable to regulate com-
bustion
Boiler does not work, E90
error code flashing on the
screen
> Aging or rust on the
electrode
> Recirculation on fluegas
path
> Blokage on flue or wrong
flue
> Electrode position
> Cabeling disconnections
> Combustion calibration
> Electronic board
> Gas valve failiure
1-) Call for authorised service at first
E 92
Air compensation active
Boiler does not work, E91
error code flashing on the
screen
> Possible wind precence
> Aging or rust on the
electrode
> Recirculation on fluegas
path
> Blokage on flue or wrong
flue
> Electrode position
> Combustion calibration
> Min power adjustment
1-) Call for authorised service at first
E 93
Unable to regulate combus-
tion (temporarily)
Boiler does not work, E93
error code flashing on the
screen
> Aging or rust on the
electrode
> Recirculation on fluegas
path
> Blokage on flue or wrong
flue
> Electrode position
> Combustion calibration
> Gas valve failiure
> Electronic board
1-) Call for authorised service at first
