67
13 - TROUBLE SHOOTING
Error Code Table
Error
Code
Description
Probable Causes
Checking/Solution
E10
E11
Temperature difference
between the supply and
return temperatures too
great
Sensor fault
Sensor not/poorly connected
No circulation
Replace the sensor if necessary Purge the air in the
heating system
Check for water circulation (direction, pump, valves)
Check that the sensors are operating correctly
Check the cleanliness of the heat exchanger Check that
the heating pump is operating correctly
(CHART 4)
E12
Temperature of heat
exchanger is above the
normal range (high-
limit thermostat Safety
Thermostat)
Bad connection Sensor fault
Sensor not/poorly connected
No circulation
Check the wiring
Replace the sensor if necessary Purge the air in the
heating system
Check for water circulation (direction, pump, valves)
Check that the sensors are operating correctly
Check the cleanliness of the heat exchanger Check that
parameter P35 has been set correctly
(CHART 3)
E14
5 burner start-up failures
No ignition
Check spark generator wiring
Check the ionization/ignition electrode Check the
condition of the burner Check the grounding
Defective control SU PCB
(CHART 5)
Presence of spark but no
flame formation
Purge the gas supply to remove air Check that the gas
valve is fully opened Check the gas supply pressure
Check the operation and setting of the gas valve Check
that the air inlet and exhaust flue are not blocked
Check the wiring on the gas valve Defective control SU
PCB
(CHART 5)
Presence of the flame but
insufficient ionization (<3 μA)
Check that the gas valve is fully opened Check the
supply pressure
Check the ionization/ignition electrode
Check the grounding
Check the wiring on the ionization/ignition electrode
(CHART 5
E16
False flame signal
Ionization current present
when there should not be a
flame
Ignition transformer defective
Gas valve defective
The burner remains very hot:
CO too high
Check the ionization/ignition electrode Check the gas
valve and replace if necessary Recalibrate the CO2
(CHART 2
E17
Problem on SU PCB
Bad connection
Defective SU PCB
Check the wiring
Inspect the SU PCB and replace it if need be
E34
Fan fault
Bad connection
Fan defective
Check the wiring
Replace Fan if necessary
Check for adequate draw on the flue connection
(CHART 7)
E35
Supply and return reversed
Bad connection
Sensor fault
Sensor not/poorly connected
Water circulation direction
reversed
Replace the sensor if necessary
Check for water circulation (direction, pump, valves)
Check that the sensors are operating correctly Check
that the sensors have been correctly fitted
(CHART 4)
E36
Flame loss
No ionization current
Purge the gas supply to remove air Check that the gas
valve is fully opened Check the supply pressure
Check the operation and setting of the gas valve Check
that the air inlet and exhaust flue are not blocked
Check that there is no recirculation of flue gases
(CHART 6)
PN 240011656 REV. K [11/01/2020]
