Glowworm Lighting 250 I - Manual (Page 20)

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5 Fault Finding
The following tables provide information on possible
malfunctions during the operation of the solar cylinder as well
as their cause and remedy.
NOTE: Only use original spare parts from Glow-worm. for the
replacement of parts. We recommend making a maintenance
agreement.
Malfunction Cause Remedy
Solar cylinder
The cylinder cools down at night. The
flow and return temperatures vary after
switching off the pump. The collector
temperature is higher than the air
temperature at night.
. The gravity brake is blocked. . Check the position of the blue handle.
. Check the gravity brake for tightness
(jammed cuttings, particles of dirt in the
sealing face).
3. Do not connect the solar heat
exchanger directly, rather pull the supply
pipes downwards and then upwards to
the collector (syphon supports the gravity
brake) or install a -port valve, which
is switched on at the same time as the
pump.
. One-pipe circulation in the event of
short pipe networks with low pressure
loss.
Install a gravity brake (as close as
possible to the cylinder).
Reheating is not working. The boiler
runs for a short time, goes off and then
back on again. This is repeated until the
cylinder is at its target temperature.
. Air in the reheating heat exchanger. Bleed the reheating heat exchanger.
. Heat exchanger surface area too small. Compare the specifications of the boiler
manufacturer with those of the cylinder
manufacturer. The problem may be able
to be solved by a higher setting of the
flow temperature at the boiler.
Only cold or lukewarm water comes out
of the taps.
. Cold and hot water connections on the
cylinder have been mixed up.
Turn off the cold water supply, then
let water flow out via the hot water
connection. Only a few litres of water
flow out if the connection is laid correctly.
The inlet of the hot water draw-off pipe
then rests in the air space; no further
emptying is possible. If the entire solar
cylinder runs empty via the hot water
connection, the connections have been
laid incorrectly. Change the connections!
. Hot water thermostat mixer set too low. Increase the setting.
3. Solar heating insufficient; boiler does
not reheat.
External control device faulty.
Air in the reheating heat exchanger
Cylinder temperature sensor defective.
Check whether the boiler is working.
Check whether the external control
device is working.
Check whether the two port valve is in the
hot water position.
Replace the two port valve.
Bleed the reheating heat exchanger.
Check the thermal cut out and reset it.
Replace the cylinder thermostat.
Table 5. Fault Finding