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18 Trouble shooting checklist

Symptoms

Burner will not start

Red 'mains on' does not illuminate.

Red light illuminates.

HB Herringbone system only.

Fan starts but burner does not attempt

ignition.

HB Herringbone system only.

Burner proceeds to ignition stage (normally

indicated by audible spark valve energised

and 'burner on' light illuminated) but burner

does not light.

Burner lights but shuts down after

a few seconds.

Heater shuts down after operating

for a period of time.

Possible causes

External controls, thermostats, time switch etc.

not calling for heat.

Fuse blown.

Fan's connector plug not fully engaged.

Loose electrical connection.

Fan seized or faulty motor.

Sequence controller relay failing

to pull in and/or hold in.

Vacuum switch not returning to normal

(switch off) position.

Fan tripped out on overload. (Type O fans only)

Insufficient vacuum generated by fan.

Blocked emitter tube.

Combustion chamber cover permitting

air leakage.

Vacuum impulse line between combustion

chamber and vacuum switch insecure

or defective.

Vacuum switch 'pulls in' but electronic sequence Replace burner sequence controller unit but

controller does not proceed to programme

ignition sequence.

Leaks in joint separation in manifold system.

No spark.

Gas safety valve faulty or defective.

Insufficient gas pressure.

Inadequate flame signal. This can be verified

by connecting a sensitive micrometer in

series with the violet wire which passes through

the combustion chamber bulkhead. The correct

reading should be 5µA ± 1µA.

Flame unstable.

Inadequate gas supply. Observe burner

gas pressure with all heaters operating.

Insufficient vacuum at combustion chamber

causing vacuum switch to cut off.

Refer to above.

Remedy

Adjust controls.

Check for short circuit in wiring

or individual electrical components.

Engage securely.

Check all connections.

Replace fan, recommission heater,

checking gas pressure settings.

Check vacuum switch is satisfactory,

replace sequence controller.

Replace vacuum switch.

Check overload setting: single phase

3.1 amp. Reset button on in control panel.

Check for build up of condensate in fan casing.

Clean fan blades with soft bristle.

Clean emitter tube internally.

Examine condition of sealing gasket, tighten

down lid securely.

Fix securely in place.

first check that the cause of failure is not a

short on output circuit, by measuring resistance

between pins 2 and 7 of burner control unit

plug. A reading of 10,000 ohms indicates short

circuit on gas valve burner indicator light or

associated wiring.

Reseal or reconnect.

Check electrode for cracks – replace if necessary.

Check high tension connections are secure.

Check spark gap is 3.5 ± 0.5mm. If no high

tension output from electronic controller,

replace controller.

Replace solenoid operator section of gas valve.

Set burner pressure to that indicated on data

badge (see commissioning).

Replace electrode. Check connections to

electrodes and terminal 4 of electric sequence

controller plug. Replace the electronic

sequence controller.

Check cleanliness of burner and set burner

pressure as indicated on data badge.

If gas pressure drops below that indicated on

the data badge, examine gas supply pipework

for excessive pressure loss.

Clean fan blades with soft bristle brush.

Inspect tube internally and clean if necessary

(see servicing instructions).

If problem persists, replace vacuum switch.