46
FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
IMAX XTRA EL
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Installation & Servicing
57 FALSE FLAME LOCKOUT / ERROR 20
Check routing and integrity of internal boiler
wiring is OK. Check condition of Flame
Sense Electrode and replace if deteriorated.
yes
Reset the boiler, does boiler work OK?
no
Replace Flame Detection Electrode
Check routing and integrity of internal boiler wiring
yes
no
Disconnect the electrical connection to the Flame
Sense Electrode. Is there continuity between the
Electrode and earth?
58 LOW WATER PRESSURE / AIR PRESSURE SWITCH / BLOCKED CONDENSATE
Fill and vent the system and open all
Isolation Valves
no
yes
yes
no
no
yes
yes
no
no
no
no
yes
yes
yes
Are the boiler and CH system filled with water to 1.0 bar
and all Isolation and Radiator Valves open?
yes
yes
no
Ensure wiring has continuity and is
securely connected
no
Does the black wire from the Water Pressure Switch to
the PCB have continuity and is it securely connected?
Check syphon and condensate drain Pipework for
blockage. Is there a blockage?
Clear blockage and check boiler
operates
Replace any damaged tubes / remove
water or reconnect
Connect all terminals using wiring diagram
in this manual
Redesign flue to ensure >-10Pa and
<100Pa
Clear blockage and test boiler is operating
ok.
Clear blockage and test boiler is operating
ok.
Unscrew cover and set to correct
value
Check air pressure tubes are fitted correctly and not
retaining water. Are they damaged / kinked?
Is the APS connected to sump and is sump set to correct value
320kW-200Pa, 395kW-200Pa, 470kW-300Pa,
545kW-300pa, 620kW-400pa
Are all electrical connections in place and on correct
terminal?
Is flue resistance is >-10Pa and <100Pa when
operating at max heat input?
Is the flue blocked or restricted?
Is Air inlet restricted or blocked?
If optional filter is fitted, check this is not blocked.