19
221460C
8 Fault Finding
Remedy
Fault and Cause
8.1 Pilot Goes Out after a Period
of Remaining Alight
Front cover not correctly fitted.
Fit parts correctly.
Flue parts not fitted or sealed properly.
Seal cavity or fit flue parts correctly as described in
Installation Instructions.
Electrical supply failure causing
over heat device to operate.
Relight pilot.
Pump incorrectly wired.
Connect pump in accordance with diagram 5.2.
Overheat cutoff operating.
Refer to Section 8.3.
8.2 Main Burner Will Not Light
External, remote controls not “On.”
Check that any remote controls are calling for heat.
Control thermostat not on.
Check control thermostat is in an “On” position, see also
Section 8.9.
Flue Blockage Safety Device tripped.
Reset, refer to section 6
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.
Fit phial in pocket.
Faulty control thermostat.
Replace control thermostat.
8.4 Overheat Cutoff Device
Cuts Out Prematurely
Air in heating body.
Vent system. Alter system layout if necessary.
Water circulation low or stopped.
Pump not functioning correctly. Check pump is
wire directly to the boiler. Alter system if necessary.
Overheat cutoff device operates before boiler
cycles on maximum control thermostat setting.
Change faulty overheat cutoff device.
The correctly set overheat cutoff device operates
prematurely. There is no air in the heating body
and water circulation satisfactory.
Change faulty heating body.
Pump not functioning correctly.
Check pump is wire directly to the boiler.
Alter system if necessary.
8.5 Insufficient Heat
Control thermostat set too low.
Increase setting.
Inlet gas pressure inadequate.
Increase gas pressure.
Governor setting incorrect.
(make sure control thermostat is on maximum setting).
Check burner pressure against data label.
Reset only if more than 10% away from required figure.
8.6 Appliance Noisy in Operation*
Overgassed.
Check burner pressure against data label and adjust only if
more than 10% away from stated required figure.
Complete lack of water.
Check system controls for correct installation or correct type
of controls.
Air in system.
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.
Water flow rate.
Check that flow rate is correct. Check that pump is correct
size and is correctly adjusted. Bypass not fitted or set
correctly.
*
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.