Not enough hot water

Hi I have a pulsacoil 2000 and seem to be having some intermittent hot water issues with the off peak switch. The water is hot but not as hot as it used to be and doesn't seem to last more than 2 showers. The water tank should be connected to the mains so there should be enough water in it. The circuit board has a flashing red light, which flashes twice each time. Both the green and red light on the main panel are off but I notice these have have been off for a long while before these intermittent problem started happening.

When I take the front cover off, the pipes and pump feel hot. I am on economy 10 electricity tariff and I normally just leave my off peak night switch on and I would have water to use in the mornings and in the evenings. But the water now is sometimes just lukewarm. However, the booster switch seems to be working fine and I get more hot water when I switch this on. Nevertheless, I do not want to rely on this booster switch too much as the electricity costs will be a lot higher.

Any suggestions as to what could be wrong?

It looks like you have trouble with the off peak heater (the bottom one)
When you use the boost that is the on peak heater (top one)
Your unit is a thermal store.
It is similar to a battery. A thermal store is charged with hot water.
When you turn a hot tap on, there are 2 sensors.
One works the pump to pump water round the plate heat exchanger.(PHE)
The other is a temperature sensor.
The cold water goes into the PHE get heated by the store water.
The temperature sensor determines the water temperature to 50-55 c
If all is well that what comes out of your hot tap.
If you have the books, user manual and Installation manual they will confirm the above.
If no books down load them for free from Gledhill Response.
The link is on this site. But you should have no trouble finding them.
Next if you need an engineer.
Look in Yellow pages.
Google one for your area putting PC 2000 in your search.
Or call Gledhill who may cover your area or give you a number of someone who does.
The PC 2000 is a fairly easy unit to work on compared to the A class units.
But they are not really a DIY job. Unless really competent.
If your bottom heater has gone, that will involve draining the unit.
Fitting a new heater after removing the old one.
Of course a new rod stat too.
I would also recommend putting a litre of inhibitor in the unit to every 100 litres.
This does help to keep sludge at bay. Also protects the pump etc.
I have giving a lot more info than I normally would.
But as this post will be in the Pulsacoil 2000 posts, I would hope more will read it.
All of the above have been posted before many times.
Mike
MGC/H2O
Norfolk.

Many thanks Mike for all your information. Will have to try and get an engineer to come out soon.

Hi Wendy,

Hopefully by now your problem has been resolved. I would like to recommend you request the self check Pulsacoil mini guide which could help you with basic faults in the future. You can request it via this link: Pulsacoil