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Saunier duval isofast f35e condens boiler is making loud vibrating kind of sound when hot water tap is turned on. Could this be the fan? Boiler is 15 months old

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  • adrian69 Jan 15, 2009

    I have the same problem. My boiler is also 15 months old, and everytime you use the hotwater the pipes bang. Also sometimes there is no hot water at all only tepid and the heating comes on by itself, although it is not timed to and the eco temp is set at 6 degrees. AND it loses pressure quite often and forget using a tap and having a shower at the same time. Plumber been out twice, the problems are getting longer with this boiler.

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5 Suggested Answers

zeusfaber
  • 247 Answers

SOURCE: Vaillant Ecotec combi boiler -

David,

The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.

What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.

A.

Posted on Oct 07, 2008

jcpark50
  • 52 Answers

SOURCE: boiler making a loud hissing

sounds like a stuck expansion valve, the compressor makes pressure, but it can't be released to absorb heat from the desired environment. You could go to the manufacturer's website, request a detailed diagram of your system, find the expansion valve and order a new one. Can you put it in yourself and recharge the system? Probably not, call a repairman.

Posted on Nov 07, 2008

  • 1 Answer

SOURCE: hi,i have a vaillant turbomax

I had this. Open up the main case, take the second inner case front off to expose the boiler.

Clean the thermocouple which detects the flame being lit with some steel wool held with needle nose pliers. It will be all sooty and will turn off the gas as a safety precaution if it does not detect heat fast enough.

Don't listen to the gas man who will say "needs a new circuit board mate" as this is usually a stock response.

Posted on Jan 05, 2009

  • 1 Answer

SOURCE: Repressurise Potterton Performa 24 boiler

hope this is helpful. On my potterton 24 combi boiler it is the valve that sits the lowest, with a slight indent in the black tap. if you turn this for a short period you will hear a hiss and the pressure will quickly build to the desired pressure, when you can them turn the tap back off.

Posted on Feb 05, 2009

  • 3 Answers

SOURCE: How do I increase the water pressure on the saunier Duval boiler?

not enough infromations give more detail

Posted on Dec 09, 2009

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