Worcester Greenstar Ri Manuel de service télécharger pdf (Page 58)

FAULT FINDING AND DIAGNOSIS

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7 FAULT FINDING AND DIAGNOSIS

7.1 FAULT FINDING

The electronic control system for this boiler

incorporates a blue central indicator. This normally

confirms the permanent mains supply but, by flashing at

different rates during a fault, provides a guide to the

cause as listed.

This fault finding system assumes that the appliance has

been operating normally until the time of failure (i.e. not

a first installation error).

PRELIMINARY CHECKS : Preliminary electrical system

checks are the first electrical checks to be carried out

during a fault-finding procedure. On completion of the

Service/Fault-Finding task which has required the

breaking and remaking of electrical connections, check:

(a) EARTH CONTINUITY,

(b) SHORT CIRCUIT CHECK,

(d) RESISTANCE TO EARTH.

This fault finding information is for guidance

only. Worcester cannot be held responsible

for costs incurred by persons not deemed to

be competent.

Blue light

indication

Fault Possible solution/check

No light No power at

control board

Permanent mains supply to boiler.

Boiler mains switch ON.

Fuse F1 - 2A Slow blow.

Fuse F2 - 1.25A Anti-surge.

Transformer (both coils below 100 Ω.

Otherwise replace control board.

Light ON Boiler ON but not

operating during

demand

Live demand at ST2 terminal L

- is there a demand?

Manual bypass is open.

If CH is working check HW controls

If HW is working check CH controls (i.e. external diverter valve,

frost stat, room stat/programmer.

Otherwise replace board.

Slow flash

(mostly off,

flashes on)

Ignition lockout B Gas present and at correct pressure?

B Gas valve

– Check that there is 35V d.c. to each solenoid

– Check the resistance of each solenoid:

Top solenoid = 380 Ω ± 10% (342 - 418 Ω)

Bottom solenoid = 190 Ω ± 10% (171 - 209 Ω)

B Combustion CO

level.

B Flue condition.

– Blocked flue?

B Blocked condensate pipe or frozen condensate.

B Gas valve adjustment.

B Ignition electrodes/harness/connections.

– Check for condition and resistance of leads

(approximately 2100 Ω)

B Otherwise replace control board

Tab. 24 Fault finding

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 67 68

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Worcester Greenstar Ri Manuel de service Page 58

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