Technical data

40
Alpha 240XP and 240XE - Fault Finding
10.4 CENTRAL HEATING - Follow operational sequence
YES
YES
Turn thermostat to max.
External controls
calling for heat
If fitted, internal
clock calling for heat
240 V across main
terminal block,
terminals 1 and N
YES
Replace relay PCB
Relay energised
and contacts closed
i.e. continuity between
terminals 31, 32 on
PCB
NO
YES
Turn selector to and
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A
YES
Pump runs
NO
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B
Primary flow switch operated
NO
YES
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C
Fan runs at max. speed
NO
YES
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D
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J
Air pressure switch proved
Spark at ignition electrodes
for upto 10 seconds
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L
YES
NO
NO
YES (240XE)YES (240XP)
YES
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E
Press red button to reset
NO
YES
(240XE only)
Burner lights
YES
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F
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I
Burner output modulates until
set temperature is reached
Burner goes out
NO
YES
Operation sequence successful
Pump continues to run for
5 minutes
YES
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G
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H
Red reset button
illuminated
But, burner does not stay
alight after 10 seconds
If still illuminated,
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K
(240XE only)
YES (240XE only)
YES (240XP only)
Fan stops
Fan reduces to slow speed
YES