Pulsacoil 2000 - hot-cold-hot-cold-warm-cold

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Pulsacoil 2000 - hot-cold-hot-cold-warm-cold

Post  taa on Tue Feb 07, 2012 3:25 am

Have Pulsacoil 2000.

Get warm-hot water through the taps for 5 seconds, then cold, then warm again, then cold. Makes showers like a game of roulette. This happens on all taps, so don't think it's a local thermostat issue. The boiler also does not seem to hold much hot water anyway e.g. a bath not possible.

Have had a a plumber (non-Gledhill specialist) to check the Pulsacoil. PCB is fine, voltages are fine, control circuit light is constant green, upper tank is topped up with water. The unit appears to be heating, when timer is on, and is warm.

Some thoughts -

Might the pump be faulty? The plumber commented that is was in "limp mode". Maybe insufficient water pressure to the immersion heater?
Might the boiler be scaled up?
For a long time, the boiler did not have an upper water tank (for some reason). One is now fitted, but might something have gone wrong in the meantime?

Any comments or further ideas would be very appreciated!

Tim

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Re: Pulsacoil 2000 - hot-cold-hot-cold-warm-cold

Post  Midland Boilercare on Tue Feb 07, 2012 11:10 am

HI Tim

It doesn't sound to me as though you have anything major wrong with the unit.
The symptoms you have described indicate a faulty temperature sensor.

The pump being "in limp mode" is perfectly ok, the pcb alters the voltage to the pump and it may have only be supplying 50v to it when your plumber checked it.
Get a Gledhill specialist to have a look at it. We cover most of the Midlands, but others on this forum cover other areas.
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Re: Pulsacoil 2000 - hot-cold-hot-cold-warm-cold

Post  taa on Tue Feb 07, 2012 11:13 am

Thank you David. Now looking for a Gledhill specialist in the London (SE) area.

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Re: Pulsacoil 2000 - hot-cold-hot-cold-warm-cold

Post  Midland Boilercare on Tue Feb 07, 2012 11:15 am

No problem Tim.
Try MK Group in the specialists area, I'm sure they cover the London area.
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