120120
Warnings
Installation
Use
Malfunction
observed
Possible cause
Diagnostics and
troubleshooting
Condensate over-
ow (stagnant
water in the outside
unit's lower
housing)
• Condensate drainage
obstructed.
• Clean.
Odour • No siphon on the pres-
sure relief valve
• No water in the pressure
relief valve
• Install a siphon.
• Fill the siphon.
Steam release
when drawing o.
• Electric backup is contin-
uously switched on.
• Turn o the power sup-
ply and notify the heating
engineer.
Heat pump oper-
ates outside the o-
peak hours.
• No o-peak signal
detection.
• Check the wiring and trans-
mission of the o-peak
signal.
• Modify the setting for the
O-Peak hours signal.
The heat pump runs
in short bursts, and
the electric backup
operates almost
continuously.
• Air temperature outside
the tolerance range
• Outside unit sensor
malfunction
• Evaporator extremely
contaminated
• Presence of non-con-
densable gases
• Wait until temperature is
back within the tolerance
range
• Inform the installer.
• Clean the evaporator.
• Empty and rell the circuit.
Control panel
failure or display
problem.
• No power supply.
• Control panel fault
• Power board fault.
• Check the power supply.
• Replace the control panel.
The heat pump
does not start
Outside starting conditions
• tank top too hot;
• operating conditions out-
side of time slots;
• anti-short cycle
• Normal operation. Try
in cooling mode (fewer
conditions).