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Feroli optimax 25c erratic behaviour

Have a Feroli optimax 25 combi boiler, it's always been a little odd with the hot water temps, either scalding hot or tepid with low pressure from hot taps.

Now it's developed a new problem, the hot water is now scalding, tepid or completely cold. Also the heating is continually on and the pressure has gone up from 1.5 bar to 2.5. All kinds of weird numbers flashing up on the display from 00 to 99.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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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

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brainyass
  • 242 Answers

SOURCE: Triton Electric Shower Temperature too hot

You could have mineral deposits on the temperature probe inside of the unit. If you remove the heater and purchase a bottle of lime and scale remover (lime away) to put inside of it. Let the unit sit full of water and chemicals for 24 hours. Flush out the unit to remove any residue. You may see the water is brown if you have a lot of buildup. Reconnect unit and test your settings. If this doesn't work, install a anti-scalding device, available at a plumbing supply store.

Posted on Oct 23, 2008

  • 104 Answers

SOURCE: Combi Boiler - Running warm & then cold!? HELP!

mixing valve must be replaced

Posted on Nov 02, 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

rockitman187
  • 2559 Answers

SOURCE: ferroli optimax 31c

Here is a link to the manual.It shows fault codes.
http://www.ferroli.co.uk/Product_Documentation/Domestic/Optimax_HE_31_C_Manual.pdf

Please rate this solution.

Posted on Jan 17, 2009

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