CLIVET WSAN-YMi 21, Manual For Installation, Use And Maintenance, Page: 102 / 156

102
POSSIBLE CAUSES CORRECTIVE ACTION
The unit must start up out of its
operation range (the water
temperature is too low).
In case of low water temperature, the system utilizes the backup heater to reach the minimum water
temperature first (12°C).
• Check that the backup heater power supply is correct.
• Check that the backup heater thermal fuse is closed.
•
Check that the backup heater thermal protector is not activated.
• Check that the backup heater contactors are not broken.
The unit is turned on but the compressor is not starting (space heating or domestic water heating)
There is air in the system. Purge air.
Water pressure at pump inlet is
too low.
• Check on the manometer that there is sufficient water pressure. The water pressure must be > 1
bar (water is cold).
• Check that the manometer is not broken.
• Check that the expansion vessel is not broken.
•
Check that the setting of the pre- pressure of the expansion vessel is correct (refer to WATER
CONNECTIONS - Checking the water volume and expansion vessel pre-pressure").
Pump is making noise (cavitation)
Dirt is blocking the water
pressure relief valve outlet.
Check for correct operation of the pressure relief valve by turning the red knob on the valve counter
clockWise:
•
If you do not hear a clacking sound, contact your local dealer.
•
In case the water keeps running out of the unit, close both the water inlet and outlet shut-off
valves first and then contact your local dealer.
The water pressure relief valve leaks
The expansion vessel isbroken. Replace the expansion vessel.
The filling water pressure in the
installation is higher than
0.3MPa.
Make sure that the filling water pressure in the installation is about 0.15~0.20MPa (refer to WATER
CONNECTIONS - Checking the water volume and expansion vessel pre-pressure").
The water pressure relief valve opens
13 TROUBLE SHOOTING