Baxi Eco 3 Wartungshandbuch PDF herunterladen (Seite 37)

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 thermostat

to max.

Pump runs

Air pressure

switch proved

illuminated

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’

Go to section ‘B’

Go to section ‘C’

Go to section ‘J’

Go to section ‘D’

Go to section ‘E’

Replace PCB

Turn selector to the reset

position. If the light does

not extinguish go to

sections H & K

Go to section ‘F’

Go to section ‘I’

Go to section ‘G’

Fan stops Pump stops

Operation sequence

correct

Has safety thermostat

been activated?

Press reset button on

safety thermostat. If

regular resetting is

required, or appliance still

does not operate,

investigation is necessary

External controls and,

where fitted, integral timer

calling for heat

Ensure controls are set to

demand and verify the

contacts are closed

Burner extinguishes

after 10 seconds

YES

YES YES YES

NO NO

YES

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