Baxi Potterton 24 Eco HE Fault Finding, Publication No, Carry out initial fault finding checks

15.0 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 13.1 “Illustrated Wiring Diagram” for position of numbered terminals

Central Heating - Follow operational sequence

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

Primary flow switch	NO
operated
YES
	NO
Fan runs at max speed
YES

Air pressure	NO
switch proved
YES
Spark at ignition

Go to section ‘C’

Turn the selector switch to the ‘Reset’ position and hold for at least 2 seconds. If regular resetting is required, or appliance still does not operate, investigation is necessary

Go to section ‘E’

Go to sections ‘J’, ‘L’ &

‘D’

NO

electrodes for up to 10

seconds

YES

Burner on	neon	NO
illuminated
YES		YES
Burner extinguishes
after 10 seconds
NO
Burner output		NO
modulates until set
temperature is reached
YES		YES
Burner goes out

illuminated

NO

Replace PCB

Go to section ‘F’

Go to section ‘I’

Go to section ‘G’

Fan stops

YES

YES

Turn selector to the reset position. If the light does not extinguish go to sections H & K

Pump stops

YES

Operation sequence

correct

Publication No. 5111811 41