Glowworm Lighting 250 I, 300 I, 200 I manual Malfunction Cause Remedy

5 Fault Finding

Malfunction	Cause	Remedy
Water flows out of the expansion relief	Dirt on the valve seat of the expansion	Check the expansion relief valve and
valve (only when heating up).	relief valve.	reset it manually.
	Pressure limiting valve defective.	Switch off the boiler and immersion
		heater and check whether the pressure
		behind the pressure limiting valve is lower
		than 3.0 bar if water flows out only when
		heating up. If so, replace the pressure
		limiting valve.
	Expansion vessel defective.	Check the pressure in the expansion
		vessel. If the pressure is insufficient,
		re-establish the pressure and check
		whether the equalisation tank maintains
		the pressure.
	Expansion relief valve defective.	If the pressure is normal, replace the
		expansion relief valve.
Water comes out of the temperature and	Dirt on the valve seat of the temperature	Check the seat of the temperature
pressure relief valve (only when heating	and pressure relief valve.	and pressure relief valve and reset it
up).		manually.
	Temperature control of the boiler	Check the temperature control of the
	defective.	boiler if water only comes out when
		reheating with the boiler. Check whether
		the two port valve switches to the heating
		position after reaching the cylinder
		temperature.
	Cylinder temperature sensor defective.	Check the cylinder temperature sensor
		and the corresponding thermal cut outs
		and replace the temperature sensor and
		reset the thermal cut outs if necessary.
	Two port valve defective.	Check whether the two port valve is
		working and replace it if necessary.
	Temperature and pressure relief valve	Replace the temperature and pressure
	defective.	relief valve if water only comes out when
		heating up with the immersion heater.
	Immersion heater defective.	Check the temperature sensor of the
		immersion heater and the corresponding
		thermal cut out and replace the
		immersion heater if necessary.
		Table 5.1 Fault Finding (continued)

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