worcester 280 no dhw

Joined
26 Jun 2005
Messages
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Location
Tyne and Wear
Country
United Kingdom
280 works fine in ch mode but when hot tap opened boiler fires but nothing through plate heat exchanger. diverter valve? if so are they easy to change
 
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Have a look underneath at the diverter valve arm and see if it moves across for heating and then back to rest in hot water....I would guess not and it is sticking in heating
 
The diverter valve powers over to the ch position and rests in dhw mode so i cant see it sticking in the ch pos but it poss ,can you see the lever on the side of the valve move after a ch demand (takes 12 seconds). if the ch is off and you turn a hot tap on does it fire up.
 
arm on diverter valve is not moving. stuck in position b. yes it does fire up when ch off, but no hot water
 
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Yeap, diverter valve sounds stuck, did one on thursday gone actually :) Remember to fully drain down sysytem and cover the pcb box with a plastic bag and a towel (Tip) + turn off electrics as well. Failing that, get a guy who knows and works on them.....
 
IF this is the one with the Honeywell actuator then the plunger will be stuck down.

They can be cleaned or often freed up without taking them apart. There is a repair kit for them.

If I am thinking of another model then sorry!

Tony
 

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