25
4.6 QUICK FAULT DIAGNOSIS
FOR USE CARRIED OUT BY A
PROFESSIONAL TECHNICIAN.
Fault detected
Possible cause
Diagnosis and solution
Insufficiently hot water.
The main power supply of the water heater is not permanent.
Check that the appliance power supply
is permanent.
Check the absence of cold water return
on the hot water circuit (faulty mixer
possible).
Temperature setpoint adjustment too low.
Set the setpoint temperature higher.
ECO mode selected and air temperature out of range.
Select the AUTO mode. Check the dura-
tion of the programming intervals.
Heating element or its wiring partially out of service.
Check the resistance on the bundle con-
nector and the bundle condition.
Check the safety thermostat.
More central heating / C.H.
No hot water.
No water heater electric power supply: fuse, wiring...
Check for voltage on the power supply
wires.
Check the system settings (see the
operating slots).
Insufficient amount of hot water
at max setpoint (62°C).
Under-sizing of the water heater
Check the duration of the programming
slots.
ECO operation
Select the AUTO mode
No flow rate at the hot water tap.
Blocked safety unit filter.
Clean the filter (see maintenance
chapter).
Encrusted water heater.
Descale the water heater.
Continued water leak to the
level of the safety unit outside
the heating period.
Safety valve damaged or clogged.
Replace the safety unit
Network pressure too high
Check that the outlet pressure of the
water meter does not exceed 0.5 MPa
(5 bar), otherwise install a pressure
reducer set at 0.3 MPa (3 bar) at the be-
ginning of the main water distribution.
The heat pump
does not work.
Air temperature off range.
Automatic restart every 2 hours.
Pump status outside the safety temperature operating area.
Automatic restart, normal product
operation.
The electrical integration does
not work.
Securing the mechanical thermostat.
Reset the thermostat safety to resistance
level.
Faulty electrical thermostat.
Replace the thermostat.
Faulty resistance.
Replace the resistance.
Condensate leakage.
Blocked condensate drain.
Clean.
Odour.
No siphon on the safety unit or at the condensate drain.
Install a siphon.
No water in the safety unit siphon.
Fill the siphon.
Control panel fault or display
problem.
No power supply.
Check the power supply.
Check the connection (reference A3).
Display error.
Replace the display.
N.B.:
Do not connect the power supply directly
to the electrical resistance.
After maintenance or repair, check the correct
operation of the water heater.
Summary of Contents for 3.030072
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