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 Topic: No hot water to any tap - Cold ok
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31/3/2012 at 3:13pm
Location: Aylesbury
Outfit: Abbey Oxford 1996
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Joined: 12/7/2006 Standard Member
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Hi all, just prepping the caravan for the first trip out this year and have an issue with the hot water system.
I have cold water to all taps but when they are closed and I call for hot water, none flows to any tap. I have drained the system a few times to remedy the fault and their is hot water in the heater when I drain it, so that's getting hot, but its not getting to the taps and the pump doesn't fire up either on the hot taps.
The van is a 96 Abbey County Oxford and has a Carver Cascade system.
A bit of research points to either a microswitch but the only microswitches I can locate are on the shower taps,we never use it, and none on the kitchen sink or toilet basin.
The other area possibly is the heater non return valve, any ideas which valve that is on the heater?
Any ideas on which to try first
Or if you have any other ideas, please let me know, I'll give anything a try.
Thanks for any help you can give.
All the best, Rich
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31/3/2012 at 6:55pm
Location: None Entered
Outfit: http: www.arcsystems.biz
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The non-return valve is part of the cold water inlet fitting on the bottom right corner of the Cascade.
A quick check if it's working or not is to remove drain bung and switch the pump on, water should spurt out about a foot, if the flow is poor the non-return valve is the most likely problem
Unless already replaced with the later black plastic fitting, it should then be a white plastic fitting, if so you can slacken the jubilee clip and unscrew the outer nut nearest the hose, don't try removing the whole thing from the heater or it will most likely snap off.
Once the nuts undone, you will find a nylon 'shuttle' with a tiny white 'o' ring on one end, make sure it's perfectly round and in place. If all looks good you can put it all back together.
If it still does not work it will need replacing.
If it's already black plastic, then while testing with the pump on, try wiggling the tip of a slim screwdriver at the back of the drain bung hole, this will 'tickle' the tip of this style valve and combined with the pump pressure often frees it.
If not though this will also need replacement
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31/3/2012 at 7:44pm
Location: Aylesbury
Outfit: Abbey Oxford 1996
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Superb advice as usual gents, many thanks. Going with a replacement of the non return valve, tried all the suggestions, no spurt of water from the drain plug, the valve is the white version, I take it this would have been the original, is there a difference in white and black versions or is the black the newer replacement?
Thanks again everyone, I'll let you know how I get on, may be of use to others in the long run.
Any ideas on the colour of the valve, do I need white or black?
All the best, Rich
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