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Troubleshooting
13. Troubleshooting
This section contains useful information for diagnostics and correcting certain problems that may occur in
the unit.
Diagnostic procedures and associated corrective actions can only be carried out by the local technician.
General guidelines
Before starting the troubleshooting procedure, visually inspect the unit for any obvious defects, e.g. loose
connections or faulty electrical connections.
W
WARNING
When inspecting the unit's control box, always make sure that the main switch is o.
If a safety device has been activated, shut down the unit and identify the cause before resetting it.
Under no circumstances may safety devices be jumpered or adjusted to values dierent to the factory set-
tings.
If you cannot identify the cause of the problem, contact your local dealer.
If the pressure relief valve is not working properly and needs to be replaced, always reconnect the hose
connected to the pressure relief valve to prevent water dripping from the unit while waiting for the replace-
ment.
L
NOTE
For problems related to the unit's optional kits, refer to the specific kit installation and operating manuals.
13.1 General problems
The unit is switched on but does not heat or cool as expected
Possible causes Corrective action
The set temperature is
not correct
Check the setpoint of the control unit:
• T4HMAX, T4HMIN in Heating mode.
• T4CMAX, T4CMIN in Cooling mode.
• T4DHWMAX, T4DHWMIN in DHW mode.
The water flow-rate is
insucient
• Check that all shut-o valves in the water circuit are fully open.
• Check that the water filter is clean.
• Check that there is no air in the system (vent the system if necessary).
• Check that the water pressure is sucient on the pressure gauge. The water
pressure must be >1 bar (cold water).
• Check that the expansion tank is intact.
• Check that the resistance characteristic of the water circuit is not too high for
the pump.
The volume of water
in the installation is
insucient
Check that the volume of water in the installation is greater than the minimum
required value. See chapter “6. Water connections” on page 36. - Checking
the volume of water and precharge of the expansion tank.
Unit in alarm
Check alarm code and report the problem to your local serviceman. A list of the
alarms can be found in paragraph “10.4 Alarms” on page 150.
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