Dunkirk DMG-240 Installation, Operation & Maintenance Manual page 69

Error Description
Code
Temperature difference
E10 between the supply and
E11 return temperatures too
great
Temperature of heat
exchanger is above the
E12 normal range (high-
limit thermostat Safety
Thermostat)
E14 5 burner start-up failures
E16 False flame signal
E17 Problem on SU PCB
E34 Fan fault
E35 Supply and return reversed
E36 Flame loss
13 - TROUBLE SHOOTING
Error Code Table
Probable Causes
Sensor fault
Sensor not/poorly connected
No circulation
Bad connection Sensor fault
Sensor not/poorly connected
No circulation
No ignition
Presence of spark but no
flame formation
Presence of the flame but
insufficient ionization (<3 μA)
Ionization current present
when there should not be a
flame
Ignition transformer defective
Gas valve defective
The burner remains very hot:
CO too high
Bad connection
Defective SU PCB
Bad connection
Fan defective
Bad connection
Sensor fault
Sensor not/poorly connected
Water circulation direction
reversed
No ionization current
69
Checking/Solution
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
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
Check spark generator wiring
Check the ionization/ignition electrode Check the
condition of the burner Check the grounding
Defective control SU PCB
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
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
Check the ionization/ignition electrode Check the gas
valve and replace if necessary Recalibrate the CO2
Check the wiring
Inspect the SU PCB and replace it if need be
Check the wiring
Replace Fan if necessary
Check for adequate draw on the flue connection
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
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 4)
(CHART 3)
(CHART 5)
(CHART 5)
(CHART 5
(CHART 2
(CHART 7)
(CHART 4)
(CHART 6)
P/N 240011656, Rev. E [07/30/2018]