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17.12 FLUE FAN, REMOVAL & CLEANING
17.12.1 Remove the air circulation fan as detailed at 17.6
17.12.2 Carefully open the plastic insulators on the fan fly-lead and break the electrical connections such
that the spade connectors can be fed through the grommet on the sealing plate.
17.12.3 Remove the fixing screws holding the flue fan sealing plate in place and remove the plate.
NOTE: WHEN REMOVING THE PIPES FROM THE PRESSURE TAPPING STAKE CARE TO NOTE THEIR
POSITION!
17.12.4 Release the fixing screws holding the flue fan in place.
17.12.5 Carefully withdraw the fan and its gasket from the collector box, taking care not to damage the fan
blades.
17.12.6 Remove all dust from both the impeller and motor, taking care not to disturb the balance of the fan.
17.12.7 Refitting/replacement is in reverse order.
18.
DEFECT DIAGNOSIS
The following table shows the LED status indicator display and the corresponding fault condition, along with the lockout
type. It should be noted that under certain conditions the red LED relating to the air heater may flash. This is part of
the control sequence and the module should reset automatically. It is ONLY necessary to press the “RESET” button
if the red LED is continually illuminated!
NOTE: When the air heater and water circulator are used in combination, the status indications for the water
circulator will override those for the air heater; therefore LED displays “8” and “9” will override “5” and “6”. For
this reason, it is strongly recommended that the air heater and water circulator be commissioned independently
of each other.
DEFECT DIAGNOSIS
LED
CYCLE
FAULT CONDITION
LOCKOUT TYPE
0
Running
None - all is well
NONE
1
Air Proving
Air switch closed
ABSOLUTE
2
Air Proving
Gas valve relay ON (either)
ABSOLUTE
3
Air Proving
Air switch Closure failure
ABSOLUTE
4
Prove Heater Relay
Gas valve current, relay should be open
AIR HEATER
5
Prove Heater Valve
None (wait for ignition burner)
AIR HEATER
6
Prove Heater Valve
Flame failure
AIR HEATER
7
Prove Circulator Relay
Gas valve current, relay should open
CIRCULATOR
8
Prove Circulator Valve
None (wait for ignition burner)
CIRCULATOR
9
Prove Circulator Valve
Flame failure
CIRCULATOR
A
Running
Excessive cabinet temperature
ABSOLUTE
C
Running
Air flow sensor our of range
AIR HEATER
E
Running
Problem with air circulator fan
AIR HEATER
F
Running
Air heater limit stat
AIR HEATER
H
Running
Circulator limit stat
CIRCULATOR
L
Running
Circulator limit stat
AIR HEATER
U
Running
Mains spikes detected (no fan demand)
AIR HEATER
