Tab.38 Blocking codes
Code
Text display
Possible cause/check
H00.36
Second return temperature sensor is either removed or
measure a temperature below range
Second return temperature sensor open:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
H00.37
Second return temperature sensor is either shorted or
measure a temperature above range
Second return temperature sensor short-circuited:
Bad connection: check the wiring and connectors.
Incorrectly fitted sensor: check that the sensor has
been correctly fitted.
Faulty sensor: replace the sensor.
H01.00
Communication Error occured
Communication error with the CU-GH PCB:
Restart boiler
H01.06
Maximum difference between heat exchanger
temperature and flow temperature
Maximum difference between heat exchanger and flow
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 ven
ted to remove air.
Sensor error:
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
H01.07
Maximum difference between heat exchanger
temperature and return temperature
Maximum difference between heat exchanger and re
turn 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 ven
ted to remove air.
Sensor error:
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
H01.08
Delta T Max 3
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 installation has been correctly ven
ted to remove air.
Sensor error:
Check that the sensors are operating correctly.
Check that the sensor has been fitted properly.
H01.09
Gas Pressure Switch
Gas pressure too low:
Gas pressure too low:
Check the gas supply pressure.
Check whether the gas tap is properly open.
Wiring fault: check the wiring.
Faulty gas valve: check the gas valve and replace it
if necessary.
12 Troubleshooting
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