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Mend Worcester 28i junior Boiler Pressure Heating Engineer

what is problem with my, Worcester 28i junior boiler?

the pressure dropped and the reset lamp was flashing. Toppd up pressure withloop to 1.5~ 2 bar and reset. boiler runs okay for 10~15mins then light starts flashing again.

Switch unit off. Let it stand for 30 mins, switch back on unit fires up , okay for 15 mins then same situtation as above.
Local heating engineer changed pump but no success and now says main board is the problem. (Is this correct)
Also informs me that the PC board damaged the pump which is why he changed it? I find this very hrd to beleive.
Would like your opinion and help

Don Barker
April 2008
WorcesterWorcester 28i juniorHeating, Home Heating SystemsBoiler Pressure Heating Engineer
boiler goes through start sequenc, ignition ok but no gas fails to fire up New gas valve fitted

ed McGregor
December 2012
What is the correct PC board for worcester 28I junior?

ed McGregor
December 2012
has the system been vented ( the radiators ) if not vent them then top the pressure back up . you need to vent the heat exchanger which is inside the boiler at the top next to the fan and has a plastic tube connected you just unscrew the nut ONLY 1 OR 2 TURNS till the air is released then tighten back up but dont overtighten, then top the pressure up if needed the system should be ready to fire up . hope this helps

kevin
April 2008

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Worcester 28i Junior Boiler: Low Pressure & Reset