22
FAULT FINDING CHART
PRESS FAN CONTROL
ON
.
DOES THIS ILLUMINATE THE CONTROL
BOX LIGHT.
CARRY OUT MAINS CHECK
IS MAINS ALRIGHT
CORRECT MAIN SUPPLY FAULT
CORRECT FAULT
REPLACE VANE SWITCH ASSY
.
CORRECT FAULT
REPLACE FAN ASSY.
REMOVE BLOCKAGE/RESTRICTION
REPLACE FAN CONTROL BOX.
REPLACE FAULTY FAN CONTROL BOX.
CHECK VALVE SWITCH OPERATION
IS VANE SWITCH OK.
CHECK FAN OPERATION
IS FAN OK.
IS THE FLUE OUTLET CLEAR OF
RESTRICTION BLOCKAGE
CORRECT FAULT
REPLACE FAN ASSY
CORRECT GAS SUPPLY FAULT
CORRECT FAULT WITH IGNITION SYSTEM
DISCONNECT THERMOCOUPLE LEADS
FROM FAN CONTROL BOX AND
CONNECT TEST LEADS INTO THIS
TERMINAL BLOCK.
WITH THE FAN SWITCHED ON DOES THE
METER READ LESS THAN 0.5 OHMS
REPLACE THERMOCOUPLE GAS
CONTROL AS APPROPRIATE.
CHECK FAN WIRING
AND/OR
REPLACE FAULTY CONTROL BOX.
REPLACE FAULTY GAS CONTROL
NO
YES
YES
YES
YES
YES
ON RELEASING
ON
SWITCH DOES THE
LIGHT STILL ILLUMINATE.
DOES FAN OPERATE.
AFTER APPROX. 5-10 SEC’S DOES THE
LIGHT EXTINGUISH
.
IS THE FAN SPEED REDUCED.
OPERATE GAS CONTROL
IS GAS AVAILABLE AT THE PILOT.
DOES PILOT BURNER IGNITE.
ON RELEASING THE CONTROL KNOB
DOES THE PILOT REMAIN ALIGHT.
WITH THE FIRE ALIGHT PRESS THE FAN
CONTROL
OFF
BUTTON.
IS THE FAN TURNED OFF.
IS GAS TO PILOT SHUT OFF
APPLIANCE SYSTEM OK.
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
START
YES
YES
Summary of Contents for Coalbrookdale Little Wenlock Gas Power Flue
Page 20: ...19 SERVICING AND REPLACEMENT PARTS FIG 29 DESN 511315 ...
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