Thermor 266002, Manual

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Displayed Code Reason Result Service action
Error 301
HP performance
is low
HP stopped.
Heating with
electric backup.
Check the operation of the ventilator.
Check the refrigerant R134a charge.
Check that the air circulates without any obstacles.
Error 302
HP performance
is low
HP stopped.
Heating with
electric backup.
Check the operation of the ventilator.
Check the refrigerant R134a charge.
Check that the air circulates without any obstacles.
Error 303
Dysfunction of
the expasion
valve
HP stopped.
Heating with
electric backup.
Check the refrigerant R134a charge.
If complete, replace the expansion valve.
Error 304 Heat pump drift
HP stopped.
Heating with
electric backup.
Check the refrigerant R134a charge.
Error 305
Temperature
sensor drift
HP stopped.
Heating with
electric backup.
Check the connections (A2) and the position of the
air intake probe and the evaporator probe. If
necessary replace the probe cable harness.
Overview Installation Operation Maintenance Warranty
Default Possible reason Diagnosis and service
Water not hot enough. Power supply is not permanent.
Set temperature too low.
Mode ECO selected & air
temperature out of range.
Electric backup or supply cables
(partially) defect.
Check that the device receives
permanently electric current.
Check that no cold water flows into
the hot water circuit (mixing tap
defect).
Select a higher set temperature.
Select the mode AUTO. Check the
periods of programming.
Check the resistance of the heating
element on the plug, and the good
shape of the cables.
Check the security thermostat.
No heating
No hot water
No power supply to the water
heater : fuse, cabling…
Check the voltage on the power
supply cable
Hot water volume not sufficient Water heater layout too small
Operation in ECO mode
Check the programmed periods
and reception of Night / Low Tariff
signal.
Select AUTO mode
Low pressure on the tab. Filter of security group clogged.
Tank full of scale.
Clean the filter.
Remove the scale from the tank.
3.2. Other failures without error code display.
48
UK