Download Vaillant VR 68 Technical data

9 Fault finding
9
Fault finding
The tables below provide information on possible faults
when the solar heating system is being operated, information on their causes and how to rectify them.
All work on the Vaillant solar heating system (installation, 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 competent 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 replacement parts.
Fault
i
We recommend entering into a maintenance agreement.
Cause
Solar pump
The solar pump doesn't work even though 1. No current available.
the collector is warmer than the cylinder. 2. Temperature difference set too high
(neither motor noises can be heard nor
or controller is not switching.
vibrations felt).
3. Maximum temperature reached.
4. The solar pump shaft is blocked by
deposits on the bearings.
5. The solar pump is dirty.
6. Solar pump is faulty.
7. The flow rate is not set correctly.
The solar pump is running but no solar
Air is in the pipe system.
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.
The solar pump kicks in late and stops
early.
When replacing parts, use only original replacement parts from Vaillant Ltd.
Remedy
Check the power cable and fuses.
Check the controller.
Check the temperature sensors.
Reduce the temperature difference.
Switch temporarily to max. speed or unblock the
rotor, insert a screwdriver in the notch and turn
it by hand.
Dismantle and clean the solar pump. Close the
flow rate limiter and pump ball valve.
Replace the solar pump.
Check the setting and adjust if necessary.
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 commissioned 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.
1. The temperature difference between
Reduce the temperature difference.
the collector and cylinder has been set
too high.
2. Collector connection pieces not insulated Insulate the collector connection pieces.
(tube collector).
Table 9.1 Troubleshooting
62
Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02