52
EN
4 TROUBLESHOOTING
4.1
System
1. THE SYSTEM DOES NOT HEAT OR HEATS POORLY
CAUSE
SOLUTION
Air in the system
With the system hot, bleed the air relief valve on the collectors and the degasser on the
solar unit. Repeat the operation for a few days.
Pump seized up
Open and close the pump to free it up, or replace it if necessary.
Dirt in the pump
Dismantle the motor and clean it.
Incorrect pump assembly
Mount the pump correctly.
Pump speed range incorrectly set.
Always set the pump to the third speed (the pump speed is controlled by the control unit).
Sealing defects in piping
Find the leakage and have it repaired by a qualified installer.
Excessive pressure in the system that causes
the safety valve to open
With the system cold, restore the heat-transfer fluid in the system, raise it to the right pres-
sure and then bleed the system when hot.
Temperature sensor incorrectly mounted
Mount the sensor correctly or replace it if burnt out.
Control unit set incorrectly
Set the control unit as explained in the instructions accompanying the device.
No supply voltage
Check the fuse in the control unit and in the fuse box.
No insulation
Insulate the system adequately using specific insulating material for solar systems.
Excessive water consumption
Measure the water consumption.
Shutters in the solar unit closed
Open all the shutters of the solar unit.
Pre-charge pressure too low or too high in the
expansion vessel
Adjust the pre-charge pressure in the solar expansion vessel to 0.3 bar less than the sys-
tem’s cold charge pressure.
Expansion vessel too small
Replace the expansion vessel and have a larger one installed (by the installer).
Non-return valve of the solar unit seized
Free up the non-return valve of the solar unit.
2. THE PUMP IS NOISY
CAUSE
SOLUTION
Air in the system
With the system hot, bleed the air relief valve on the collectors and the degasser on the
solar unit.
Repeat the operation for a few days.
Pump seized up
Open and close the pump to free it up, or replace it if necessary.
Dirt in the pump
Dismantle the motor and clean it.
Incorrect pump assembly
Mount the pump correctly.
Pump speed range incorrectly set.
Always set the pump to the third speed (the pump speed is controlled by the control unit).
3. DECREASE IN THE SYSTEM PRESSURE
CAUSE
SOLUTION
Air in the system
With the system hot, bleed the air relief valve on the collectors and the degasser on the
solar unit.
Repeat the operation for a few days.
Sealing defects in piping
Find the leakage and have it repaired by a qualified installer.
Excessive pressure in the system that causes
the safety valve to open
With the system cold, restore the heat-transfer fluid in the system, raise it to the right pres-
sure and then bleed the system when hot.
Pre-charge pressure too low or too high in the
expansion vessel
Adjust the pre-charge pressure in the solar expansion vessel to 0.3 bar less than the sys-
tem’s cold charge pressure.
Expansion vessel too small
Replace the expansion vessel and have a larger one installed (by the installer).
