Fault Finding - Glow-worm economy plus c 50 Instructions For Use, Installation & Servicing

Fault and Cause
8.1 Pilot Goes Out after a Period
of Remaining Alight
Front cover not correctly fitted.
Flue parts not fitted or sealed properly.
Electrical supply failure causing
over heat device to operate.
Pump incorrectly wired.
Overheat cutoff operating.
8.2 Main Burner Will Not Light
External, remote controls not "On."
Control thermostat not on.
Flue Blockage Safety Device tripped.
If Flue Blockage Safety Device repeatedly requires resetting, call a service engineer
8.3 Control Thermostat Will Not Cut Out
Control thermostat phial not fitted in pocket.
Faulty control thermostat.
8.4 Overheat Cutoff Device
Cuts Out Prematurely
Air in heating body.
Water circulation low or stopped.
Overheat cutoff device operates before boiler
cycles on maximum control thermostat setting.
The correctly set overheat cutoff device operates
prematurely. There is no air in the heating body
and water circulation satisfactory.
Pump not functioning correctly.
8.5 Insufficient Heat
Control thermostat set too low.
Inlet gas pressure inadequate.
Governor setting incorrect.
(make sure control thermostat is on maximum setting).
8.6 Appliance Noisy in Operation*
Overgassed.
Complete lack of water.
Air in system.
Water flow rate.
*
There remains on most boilers a residual noise more noticeable at high temperatures. Normal operation of the boiler over a period should remove most noise.

8 Fault Finding

Remedy
Fit parts correctly.
Seal cavity or fit flue parts correctly as described in
Installation Instructions.
Relight pilot.
Connect pump in accordance with diagram 5.2.
Refer to Section 8.3.
Check that any remote controls are calling for heat.
Check control thermostat is in an "On" position, see also
Section 8.9.
Reset, refer to section 6
Fit phial in pocket.
Replace control thermostat.
Vent system. Alter system layout if necessary.
Pump not functioning correctly. Check pump is
wire directly to the boiler. Alter system if necessary.
Change faulty overheat cutoff device.
Change faulty heating body.
Check pump is wire directly to the boiler.
Alter system if necessary.
Increase setting.
Increase gas pressure.
Check burner pressure against data label.
Reset only if more than 10% away from required figure.
Check burner pressure against data label and adjust only if
more than 10% away from stated required figure.
Check system controls for correct installation or correct type
of controls.
Remove air from system. When system is first commissioned
the air dissolved may take some time to boil out, therefore
attempts should be made to vent air during the first weeks of
the installation. Check venting of system, as air bubbles can
remain suspended in the water if system is not well vented.
Check that flow rate is correct. Check that pump is correct
size and is correctly adjusted. Bypass not fitted or set
correctly.
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221462C