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Code Display text Description Solution
E.00.08 THeat Ex Open Heat exchanger temperature sensor
is either removed or measures a
temperature below range
Heat exchanger temperature sensor open:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.00.09 THeat Ex Closed Heat exchanger temperature sensor
is either shorted or measures a tem
perature above range
Heat exchanger temperature sensor short-circuit
ed:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.00.20 TFlue Gas Open Flue gas temperature sensor is ei
ther removed or measures a temper
ature below range
Open circuit in flue gas sensor:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.00.21 TFlue Gas Closed Flue gas temperature sensor is ei
ther shorted or measures a tempera
ture above range
Flue gas sensor short-circuited:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.00.40 WaterPressureOpen Water pressure sensor is either re
moved or measures a temperature
below range
Hydraulic pressure sensor open:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.00.41 WaterPressureClosed Water pressure sensor is either
shorted or measures a temperature
above range
Hydraulic pressure sensor short-circuited:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E.01.04 5x Flame Loss Error 5x Error of unintended Flame Loss
occurance
Flame loss occurs 5 times:
Vent 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 unit
Check that the air supply inlet and flue gas out
let are not blocked
Check that there is no recirculation of flue
gases
E.01.12 Return Higher Flow Return tempearture has a higher
temperature value than the flow tem
perature
Flow and return reversed:
Bad connection: check the wiring and connec
tors
Water circulation in wrong direction: check the
circulation (direction, pump, valves)
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Malfunctioning sensor: check the Ohmic value
of the sensor
Faulty sensor: replace the sensor
10 Troubleshooting
74 7734324 - v.06 - 01102021
74


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