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Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
9 Fault
finding
The tables below provide information on possible faults
when the solar heating system is being operated, infor-
mation on their causes and how to rectify them.
All work on the Vaillant solar heating system (installa-
tion, maintenance, repairs etc.) may be performed only
by approved competent persons.
a
Danger!
Risk of death from electric shock!
Improperly executed work on the solar
heating system can result in risk to life and
limb.
>
Faults may only be eliminated by a com-
petent person approved at the time by
the Health and Safety Executive.
b
Caution!
Risk of damage due to overheating!
Not all electric immersion heaters have a
thermal cut-out.
>
Use only Vaillant Ltd. electric immersion
heaters with a thermal cut-out as repla-
cement parts.
Fault Cause Remedy
Solar pump
The solar pump doesn't work even though
the collector is warmer than the cylinder.
(neither motor noises can be heard nor
vibrations felt).
1. No current available.
Check the power cable and fuses.
2. Temperature difference set too high
or controller is not switching.
Check the controller.
Check the temperature sensors.
Reduce the temperature difference.
3. Maximum temperature reached.
4. The solar pump shaft is blocked by
deposits on the bearings.
Switch temporarily to max. speed or unblock the
rotor, insert a screwdriver in the notch and turn
it by hand.
5. The solar pump is dirty.
Dismantle and clean the solar pump. Close the
flow rate limiter and pump ball valve.
6. Solar pump is faulty.
Replace the solar pump.
7. The flow rate is not set correctly.
Check the setting and adjust if necessary.
The solar pump is running but no solar
fluid is flowing from the collector (the
solar pump is getting hot).
Forward- and return flow temperatures
are the same or the cylinder temperature
is not increasing at all or only slowly.
Air is in the pipe system.
Check the system pressure. Operate the solar
pump intermittently at maximum output. Open
the air vent on the solar pump and open and
vent the cylinder. Vent the backflow preventer.
If there is no improvement, check whether there
is a "u pocket" anywhere in the piping (e. g. at
beam projections or at the bend of water pipes).
Change the pipe routing or install additional air
vents. if the system has already been commis-
sioned and is refilled again, check the automatic
air vent: Unscrew the protective cap and check
the float using a blunt pin to make sure that it
can move freely. If the floater is jammed, change
the air vent.
The solar pump kicks in late and stops
early.
1. The temperature difference between
the collector and cylinder has been set
too high.
Reduce the temperature difference.
2. Collector connection pieces not insulated
(tube collector).
Insulate the collector connection pieces.
Table 9.1 Troubleshooting
i
When replacing parts, use only original replace-
ment parts from Vaillant Ltd.
We recommend entering into a maintenance agreement.
9 Fault finding
