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www.ultimatehandyman.co.uk Forum Index -> Plumbing Forum
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stevie g
Junior Member
Joined: 02 Nov 2008
Posts: 5
Location: STAFFORDSHIRE
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 Posted: Sun Nov 02, 2008 10:52 am Post subject: ferroli modena 80 e |
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hi just changed prv on this boiler,
refilled system and bled rads, when switched on fires for about 15 secs then shuts down and low pressure light flashes, but still shows 1 bar on gauge... the auto vent valve on pump is loose, but may still be air in boiler, also not sure if expasion tank is pressured or if it will affect operation 
anyone got a clue??
Thanks. |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sun Nov 02, 2008 12:31 pm Post subject: |
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the boiler is designed for sealed systems only and must NOT be used on open vented systems.
Explain expansion tank
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Scruff |
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stevie g
Junior Member
Joined: 02 Nov 2008
Posts: 5
Location: STAFFORDSHIRE
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| Posted: Sun Nov 02, 2008 12:59 pm Post subject: |
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hi, have checked presure in expansion tank and is sitting at 18lbs psi,
also system is sitting at 1.5 bar and boiler, pump and rads. are all vented free of air.
Could this be a problem with the circuit board telling the boiler to go into safe mode....
The water side is now as it should be but after firing boiler it still cuts off after about 10 seconds and the low pressure warnig light starts to flash  |
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thescruff
Senior Member
Joined: 10 Mar 2008
Posts: 5665
Location: Bath
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| Posted: Sun Nov 02, 2008 1:54 pm Post subject: |
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Stevie, there's two things wrong with your boiler, the water pressure switch and a DIYer playing with it.
The expansion vessel should be pre-charged to 1bar with the system empty, it has nothing to do with boiler pressure, other than to take up the expansion.
Why did you change the PRV,
Are the led5 flashing.
Check the wiring to the pressure switch and change the switch if its ok.
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Scruff |
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stevie g
Junior Member
Joined: 02 Nov 2008
Posts: 5
Location: STAFFORDSHIRE
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| Posted: Sun Nov 02, 2008 2:43 pm Post subject: |
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Hey thanks for advice,
got the wire reversed  all working ok so far.....
changed prv cause of cotinued leak, tried cleaning old one but then couldnt refill system just kept emptying onto driveway..
Thanks again  |
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