Glowworm Lighting 200 I, 250 I, 300 I manual Fault Finding, Malfunction Cause Remedy Solar cylinder

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	1. The gravity brake is blocked.	1. Check the position of the blue handle.
flow and return temperatures vary after		2. Check the gravity brake for tightness
switching off the pump. The collector		(jammed cuttings, particles of dirt in the
temperature is higher than the air		sealing face).
temperature at night.		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 2-port valve, which
		is switched on at the same time as the
		pump.
	2. One-pipe circulation in the event of	Install a gravity brake (as close as
	short pipe networks with low pressure	possible to the cylinder).
	loss.
Reheating is not working. The boiler	1. Air in the reheating heat exchanger.	Bleed the reheating heat exchanger.
runs for a short time, goes off and then	2. Heat exchanger surface area too small.	Compare the specifications of the boiler
back on again. This is repeated until the
		manufacturer with those of the cylinder
cylinder is at its target temperature.
		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	1. Cold and hot water connections on the	Turn off the cold water supply, then
of the taps.	cylinder have been mixed up.	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!
	2. Hot water thermostat mixer set too low.	Increase the setting.
	3. Solar heating insufficient; boiler does	Check whether the boiler is working.
	not reheat.
	External control device faulty.	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.
	Air in the reheating heat exchanger	Bleed the reheating heat exchanger.
	Cylinder temperature sensor defective.	Check the thermal cut out and reset it.
		Replace the cylinder thermostat.
		Table 5.1 Fault Finding

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