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NOTE
For problems related to the optional solar kit
for domestic water heating, refer to the trouble-
shooting in the Installation & Owner's manual
for that kit.
WARNING
When carrying out an inspection on the switch
box of the unit, always make sure that the main
switch of the unit is switched off.
The following checks must be performed at least once a
year by qualified person.
● Water pressure
Check the water pressure, if it is below 1 bar,fill water
to the system.
● Water filter
Clean the water filter.
● Water pressure relief valve
Check for correct operation of the pressure relief valve
by turning the black knob on the valve counter-clock
Wise:
- 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.
● Pressure relief valve hose
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
● Backup heater vessel insulation cover
Check that the backup heater insulation cover is fas-
tened tightly around the backup heater vessel.
● Domestic hot water tank pressure relief valve (field
supply) Applies only to installations with a domestic hot
water tank. Check for correct operation of the pressure
relief valve on the domestic hot water tank.
● Domestic hot water tank booster heater Applies only
to installations with a domestic hot water tank. It is
advisable to remove lime buildup on the booster heater
to extend its life span, especially in regions with hard
water. To do so, drain the domestic hot water tank,
remove the booster heater from the domestic hot water
tank and immerse in a bucket (or similar) with lime-
removing product for 24 hours.
● Unit switch box
- Carry out a thorough visual inspection of the switch
box and look for obvious defects such as loose con-
nections or defective wiring.
- Check for correct operation of contactors with an ohm
meter. All contacts of these contactors must be in
open position.
Use of glycol (Refer to 9.3 Water pipework Caution:
"Use of glycol" ) Document the glycol concentration
and the pH-value in the system at least once a year.
- A PH-value below 8.0 indicates that a significant por-
tion of the inhibitor has been depleted and that more
inhibitor needs to be added.
- When the PH-value is below 7.0 then oxidation of the
glycol occurred, the system should be drained and
flushed thoroughly before severe damage occurs.
Make sure that the disposal of the glycol solution is done
in accordance with relevant local laws and regulations.
13 TROUBLE SHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
This troubleshooting and related corrective actions may
only be carried out by your local technician.
13.1 General guidelines
Before starting the troubleshooting procedure, carry
out a thorough visual inspection of the unit and look for
obvious defects such as loose connections or defective
wiring.
When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. Under no circumstances can safety devices
be bridged or changed to a value other than the factory
setting. If the cause of the problem cannot be found,
call your local dealer.
If the pressure relief valve is not working correctly and
is to be replaced, always reconnect the flexible hose
attached to the pressure relief valve to avoid water
dripping out of the unit!
