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Code Display text Description Solution
H.01.07 Max Delta TH-TR Maximum difference between heat
exchanger temperature and return
temperature
Maximum difference between heat exchanger
and return temperature exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump,
valves).
Check the water pressure.
Check the cleanliness of the heat exchanger.
Check that the installation has been correctly
vented to remove air.
Sensor error:
Check that the sensors are operating correct
ly.
Check that the sensor has been fitted proper
ly.
H.01.08 CH Temp Grad. Level3 Maximum CH temperature gradient
level3 exceeded
Maximum heat exchanger temperature increase
has been exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump,
valves)
Check the water pressure
Check the cleanliness of the heat exchanger
Check that the central heating system has
been correctly vented to remove air
Sensor error:
Check that the sensors are operating correct
ly
Check that the sensor has been fitted proper
ly
H.01.09 Gas Pressure Switch Gas Pressure Switch Gas pressure too low:
No flow or insufficient flow:
Make sure that the gas valve is fully opened
Check the gas supply pressure
If a gas filter is present: Make sure that the
filter is clean
Wrong setting on the gas pressure switch:
Make sure that the switch has been fitted
properly
Replace the switch if necessary
H.01.13 Max THeat Ex Heat Exchanger temperature has
exceeded the maximum operating
value
Maximum heat exchanger temperature excee
ded:
Check the circulation (direction, pump, valves).
Check the water pressure.
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
Check the cleanliness of the heat exchanger.
Check that the central heating system has
been correctly vented to remove air.
H.01.14 Max Tflow Flow temperature has exceeded the
maximum operating value
Flow temperature sensor above normal range:
Bad connection: check the wiring and connec
tors
No flow or insufficient flow:
Check the circulation (direction, pump,
valves)
Check the water pressure
Check the cleanliness of the heat exchanger
H.01.15 Max Tflue Gas Flue gas temperature has exceeded
the maximum operating value
Maximum flue gas temperature exceeded:
Check the flue gas outlet system
Check the heat exchanger to ensure that the
flue gas side is not clogged
Faulty sensor: replace the sensor
10 Troubleshooting
7734324 - v.06 - 01102021 71
71


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