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24.5 - PILOT LIGHTS BUT MAIN BURNER DOES NOT LIGHT
a.
Main Gas Control - listen to the control to hear if the control motor is operating and if gas is flowing into the Burner. Change the
Receiver, and the Handset at the same time and/or gas control. Refer to Diagram for Cable connections in Section 24.
b.
Check there is no dust or debris blocking the flame from the pilot to the main burner, and that the main burner cross lighting slot
is clear of debris.
c.
Check if the main injector is blocked. Clean or Replace.
24.6 - PILOT FLAME SHORTENS, OR GOES OUT WHEN MAIN BURNER IS SELECTED
a.
Monitor the supply pressure at the isolation elbow as the main burner lights. If pressure drops, check gas pipe sizing, quality of
pipe bending. Check for debris in the gas supply and or gas filter if fitted.
b.
Check that another appliance is not affecting the gas supply pressure.
c.
The Control System as a pressure test point under the outlet pipe leading to the injector. Check the Burner Pressure are as
detailed in Section 6 Appliance Data. Ensure the test point is sealed off after checking. Check and change the main injector as
required.
d.
Check for any signs of Debris in the gas supply line and also refer to Section 23.3.
24.7 - POOR FLAME PICTURE
a.
Check the supply pressure is correct at the isolation elbow. If the pressure is low, check gas pipe sizing, quality of pipe bending.
Check for debris in the gas supply and or gas filter if fitted.
b.
The Control System as a pressure test point under the outlet pipe leading to the injector. Check the Burner Pressure are as
detailed in Section 6 Appliance Data. Ensure the test point is sealed off after checking. Check and change the main injector as
required.
c.
Check that another appliance is not affecting the gas supply pressure.
d.
Check there is not a flue/ventilation problem – carry out a spillage test.
e.
Check fuel bed layout as detailed in Section 20.
24.8 - FIRE OPERATES FOR A WHILE THEN GOES OUT
a.
Check the Section 23.4 first.
b.
Carry out a spillage test from cold. Look for signs of Discoloured Walls or Trims as this may be an indication of a Downdraught
Problem resulting in the ODS pilot cutting out.
c.
Establish how long the fire stays alight then repeat the Spillage Test around this time.
d.
Check that the Pilot is functioning correctly as detailed in Section 23.2 and also check specifically the Thermocouple Electrical
Connections and Pilot Flame size.
Downdraught problems can be related to the condition of the flue, chimney termination or geographical location; so if a
Flue Problem is thought likely but no problem is found during the investigation isolate the fire and seek expert advice.
24.9 - THERMATRONIC RADIO REQUENCY CONTROL SYSTEM DOES NOT OPERATE
a.
Check the infrared control is being correctly operated - see Section 2.2.
b.
Check for error messages and check/change batteries - see Section 21 Ignition Sequence and Section 2.3.
c.
Reset the Mertik Maxitrol Logic Circuits - see Section 2.5.
ALWAYS CONDUCT A GAS SOUNDNESS AND SPILLAGE CHECK AFTER SERVICING.
ALWAYS RESEAL THE PRESSURE TEST POINTS YOU HAVE USED AND CHECK THAT THEY ARE GAS TIGHT.
(This ac-
counts for a lot of recalls.)
ALWAYS CHECK THAT THE CONTROL SYSTEM IS WORKING CORRECTLY.
(This accounts for a lot of recalls.)
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