38
14.0 Fault Finding
Carry out initial fault finding checks
1. Check that gas, water and electrical supplies are available at the boiler. Electrical supply = 230V ~ 50 Hz.
CH water system pressurised to 0.5 bar when the boiler is cold. The preferred minimum gas pressure is 19.5mbar (natural gas), 27mbar
(butane) or 36mbar (propane).
2. Carry out electrical system checks, i.e. Ground Continuity, Resistance to Ground, Short Circuit and Polarity with a suitable meter.
NOTE:
These checks must be repeated after any servicing or fault finding.
3. Ensure all external controls are calling for heat and check all external and internal fuses. Before any servicing or replacement of parts
ensure the gas and electrical supplies are isolated.
Refer to Section 13.0 “Illustrated Wiring Diagram” for position of numbered terminals
Central Heating -
Follow operational sequence
Turn selector to
neon illuminated
Primary flow switch
operated
Fan runs at max speed
Burner goes out
Turn temperature control
to max.
Pump runs
Air pressure
switch proved
neon flashing
Burner on neon
illuminated
Burner output
modulates until set
temperature is reached
Spark at ignition
electrodes for up to 10
seconds
Go to section ‘A’
neon flashing
Go to section ‘B’
neon flashing
Go to section ‘C’
Go to section ‘J’
neons flashing
Go to section ‘D’
neon flashing
Go to section ‘E’
Replace PCB
Turn selector to the reset
position. If the neon does
not extinguish go to
sections ‘H’ & ‘K’
Go to section ‘F’
neon flashing
Go to section ‘I’
Go to section ‘G’
Fan stops
Pump stops
Operation sequence
correct
neon flashing
Turn selector to reset
position. If regular
resetting is required or
appliance still does not
operate investigation is
necessary
External controls calling
for heat
Ensure controls are set to
demand and verify the
contacts are closed
Burner extinguishes
after 10 seconds
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
NOTE:
When instructed to turn the
selector to the reset position turn the
selector switch fully anticlockwise
against the spring pressure to
position R and hold for 2 seconds to
reset the boiler.
Summary of Contents for Performa System 12e
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