hearingdog

Well the problem is no more I am pleased to say. Gratefull thanks to all forum members who responded to my call for help - your comments, advice, etc was invaluable In the event, I never did find what was causing all the trouble.....after checking the basics (water & gas supply etc) and confirming that these were ok, I removed and stripped down the unit allowing me to clean out the heat exchanger and h/e pipe (compressed air) followed by the water control valve. There was nothing obviously amiss (to quote Tony, nothing fell out and said broken) so it was a matter of thoroughly cleaning all passages, holes, etc and flushing thro' generally as outlined in "Draper's Paloma Problem" (what a usefull write up that is!) When reassembled and refitted it fired up fine and showed nothing of it's original tendancies - Back in business. Over a 20+ year period my Paloma has never once let me down and, like many things that are "totally reliable", became very much taken for granted - apart from draining out before the winter layup it never really got any attention.....in future it will. It will go on my Preventative Maitainence list so that it remains "totally reliable" for another 20 years because, for those that are not aware of it, spare parts are as rare as hen's teeth. Good luck to all.

No it isn't...it's a Paloma PH-5-3F (Mk V).

Thks for your message - I'm new to this game!! Did you receive my PM to you?

Thks Roger - very usefull and well presented info which, together with with the rest, I will take with me for a weekend with my Paloma. I feel much more encouraged now about sorting the problem. I would find a manual / parts list usefull perhaps - do you know if something is available online? (My model is same as yours) Cheers.

Thks for the info again Tony - especially the link to Draper's Paloma Problem. I do not have a manual or a parts list unfortunately - does anybody out there know if anything is available online?

Thks Tony - I will check these out (together with gas and water pressures as suggested by other members) but would be obliged if you could give me more information re the small port / diaphragm - where located, how to access, etc. Regards.

Flow seems to be unchanged from the usual. Flow seems to be unchanged from usual.

Normally very reliable unit has developed following problem:- Burner fires up ok when h/w tap turned on but then almost immediately closes down.,...almost as soon as it has closed down it then fires up again.....it will keep repeating thus while the tap is on. (pilot light remains lit ok). Can anyone throw any light on this problem for me?? Hope so! Thks.