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Fault diagnosis for professionals
IMPORTANT
Maintenance and repair operations must only be performed by qualified professionals.
A specific menu is available to operate the system and help you with your diagnostic.
This mode requires technical knowledge of the system. This mode is strictly for professionals only.
To open and close the TEST menu, press
+
at the same time
To switch the actuator being tested, press:
To change the status of the actuator, press:
+
PAC: ON/OFF operates the compressor in forced mode and the fan at low speed.
FAN: OFF/LO/HI starts the fan alone in forced mode.
ELEC: ON/OFF starts the electric backup in forced mode.
VGC: ON/OFF opens or closes the hot gas valve
t01, t02, t03: displays the instantaneous temperatures of the sensors
This mode does not take account of errors detected by the system (heating when dry) or the
sensor temperatures. Therefore, never allow the appliance to work in this configuration.
Forced operation of each actuator is automatically deactivated after 3 minutes to avoid
damaging the appliance.
Certain faults are diagnosed by the regulation, which informs the user using error codes. In this case, refer to the
Troubleshooting
section, page 22.
FAULT
POSSIBLE CAUSE
DIAGNOSTIC AND REPAIR
Off-peak/peak hours mode
programmed, but the regulation
does not detect the off-peak hours
(time clock out of order, faulty
wiring, etc.)
Switch to BOOST and check that the HC
logo appears on the display.
No water heater electric power
supply: fuses, wiring, etc.
Check that the water heater power
supply wires are live
Heating element or its wiring out of
order
Check the power supply of the water
heater
No heating
No hot water
Circuit open: wires poorly connected
or cut.
Visual inspection of the wire
connections.
Water heater not powered for long
enough. Day/night time clock out of
order, etc.
Check that the day/night time clock is in
good working order.
Temperature setting too low.
Increase the temperature setting. Refer
to the Settings menu on page 15.
Water not hot enough.
ECO mode selected and air
temperatures outside the range.
Select AUTO mode (refer to Modes on
page 17)
