Baxi Potterton 30 HE manual Fault Finding

16.0 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), 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 15.0 “Illustrated Wiring Diagram” for position of numbered terminals

Central Heating - Follow operational sequence

									NOTE: When instructed to turn the
									selector to the reset position turn the
Turn selector to				NO
					Go to section ‘A’				selector switch fully anticlockwise against
neon illuminated
									the spring pressure to ‘Reset’ position and
									hold for 2 seconds to reset the boiler.
YES
					neon flashing
					Go to section ‘B’
						YES
Turn			thermostat	NO	External controls and, where		NO	Ensure controls are set to
		to max.			fitted, integral timer calling for			demand and verify the
	Pump runs				heat			contacts are closed
YES

Primary flow switch operated

YES

NO

neon flashing Go to section ‘C’

Turn selector to reset

Fan runs at max speed

YES

NO

neon flashing

NO

YES

position. If regular resetting is

required or appliance still

does not operate

investigation is necessary

Go to sections ‘J’ & ‘M’

neons flashing Go to section ‘D’

Air pressure

switch proved

YES

Spark at ignition electrodes

for up to 10 seconds

YES

Burner on neon

illuminated

YES

Burner extinguishes

after 10 seconds

NO

Burner output

modulates until set

temperature is reached

YES

NO

NO

NO

YES

NO

YES

neon flashing Go to section ‘E’

neon flashing

NO

Replace PCB

Go to section ‘F’

neon flashing Go to sections ‘I’ & ’L’

Go to section ‘G’

YES

YES

Turn selector to the reset

position. If the neon does not extinguish go to sections H &

K

YES

Burner goes out

Fan stops

Pump stops

Operation sequence correct

48© Baxi Heating UK Ltd 2007