andytw
New Member
Owner of 2 Powermax 140 boilers and fixer of programmers
Posts: 24
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Post by andytw on Mar 26, 2017 10:52:45 GMT -5
I will be fitting one at the weekend (along with a heat exchanger and blender valve)Well that went well....NOT.... Replaced heat exchanger, and blender valve. Also swapped the leaky flow switch washer with an O-ring. Just basic plumbing exercises. Re-filled, all water tight. Turned boiler on, lit up and came up to temperature. Bath hot water appears to be better so all looking good. Will need a tenant test. Powered off, tidied up, powered on...Lock out....boiler will not light at all. Engineer coming tomorrow.
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andytw
New Member
Owner of 2 Powermax 140 boilers and fixer of programmers
Posts: 24
|
Post by andytw on Mar 27, 2017 13:06:29 GMT -5
I will be fitting one at the weekend (along with a heat exchanger and blender valve)Well that went well....NOT.... Replaced heat exchanger, and blender valve. Also swapped the leaky flow switch washer with an O-ring. Just basic plumbing exercises. Re-filled, all water tight. Turned boiler on, lit up and came up to temperature. Bath hot water appears to be better so all looking good. Will need a tenant test. Powered off, tidied up, powered on...Lock out....boiler will not light at all. Engineer coming tomorrow. All sorted now, the major drain down and fill-up had left air requiring purging from the top of the heat store. Consequence for me was that the over temp stat had tripped. It is wired in series with the gas valve, so the boiler attempts to light but no gas to light so eventually locks out. Trip reset, fired up boiler, got heating pump on and lots of air heard as it was being purged. Still ok after several hours.
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Post by Jon on Apr 13, 2017 8:40:25 GMT -5
Hi, does anyone know where i can by this flow switch from as ours has split and is not repairable. according to bristish gas there are no parts available for this boiler anylonger.
Thanks
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andytw
New Member
Owner of 2 Powermax 140 boilers and fixer of programmers
Posts: 24
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Post by andytw on Apr 13, 2017 14:11:01 GMT -5
I have been using Plumbase recently for my parts. The prices they have given me have beaten the prices they show on-line. The part you require is a P746. Plumbase are showing 8 in central store. www.plumbase.co.uk/powermax-p746-flow-switch-10000371-3532530You can look up Powermax parts here. interpart.partsarena.eu/There are still lots or parts available. You could also Google Powermax P746 or Powermax flow switch. Make sure you get it the right way up if you do get around to swapping it. Good luck.
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Post by rico on Apr 22, 2017 6:06:04 GMT -5
Thanx for the posts guys- I need to buy a new flow switch for my 155x because the threads are gone and it won't attach firmly- hence the leaks. Where can I get one? Also, the threads of the flow valve (i am guessing) it's supposed to attach itself, are also damaged_ I would not mind replacing both. I saw some quotes for 85 pounds and 135 pounds- I just want to get one as soon as possible. thnx
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