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Worcester highflow 400 central heating/hot water problem

The central heating light flashes continually and although the hot water and central heating light go on nothing happens. If I reset the central heating temperature control by switching off and then positioning I get hot water for 4 mins before it reverts back to flashing. What's the problem? How can it be fixed? I've had for about 4 years and no problems until now.

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  • bendonnelly1 Jan 02, 2009

    HI Steve thanks for that suggestion. I'm not brave enough to take the facia panel off but I'm sure you're correct there's a problem with the pump. I've just paid £400 + to get an engineer out tomorrow with a service plan. I wish I was more technical but I'm freezing here and had to something quickly. Many thanks for the suggestion once again.

  • fairfordmick May 11, 2010

    what is the system pressure

  • Stephen Evans May 11, 2010

    Wishing you the Best. your welcome. Steve

  • Stephen Evans May 11, 2010

    If you know what the circulator pump is, see if it is pumping. First turn the power switch on the side of the unit off. turn the thermostat on. then turn the power switch back on. usually the coupling assembly (2 metal pieces connected together with springs) is visible if the pump is red. if the pump is green and named gruenfos, put the metal tip of a screwdriver against it and the handle to your ear, this will act like a stethescope and determine if you can hear it. Steve.

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SOURCE: worcester bosch highflow 400

Sounds like a control panel.Detatch the block connector that serves the gas valve,see if you have power on the bare pins.both left and right pins should measure mains voltage.If you have no power at the pins its the pcb control board.Replace the board.

Posted on Nov 24, 2008

  • 577 Answers

SOURCE: central heating keeps going off for no reason.have

It sounds the furnace is going into lock out, you have a safety fault problem of some kind.
It could a ignitor, flame sensor, limit or roll out switch, etc.
You really need to have a service technician check it out.

Posted on Mar 26, 2010

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Central heating keeps going off for no reason.have to restart it on plug socket to get it on demand again.400 highflow


It sounds the furnace is going into lock out, you have a safety fault problem of some kind.
It could a ignitor, flame sensor, limit or roll out switch, etc.
You really need to have a service technician check it out.

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Worcester bosch high flow 400 lost pressure put up pressure


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Thechnical data of greenstar 15 Ri worcester


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My Worcester Bosch 35cdi boiler is flashing temp then backwards t forwards t, whats wrong with it.?


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