PulsaCoil 2000 Common Faults

Although many users might assume that a PulsaCoil 2000 thermal store is the same as a conventional hot water cylinder, the only similarity in fact is that they both hold hot water and are heated via immersion heaters. In every other respect, the two are vastly different systems. As such, we have outlined some common faults with the PulsaCoil 2000 and how you can identify them yourself.

If you are experiencing a lack of hot water, or an erratic supply of hot water, it will usually be for one of four reasons:

1. Lack of water in the thermal store. This is generally the result of evaporation, or a leak in either the internal thermal cylinder or immersion heater. If the thermostat has locked open, this can lead to steaming or ‘kettling’ of the system, causing water to evaporate internally in the cylinder, resulting in a lack of hot water at the tap outlets. You can check your hot water levels yourself using our DIY video as a guide, see the self-help video below.

2. Failure of the immersion heater element or thermostat. Failure in either of these components will prevent the system heating up, resulting in a lack of hot water.

3. Delivery system failure. An issue with the sensor, pump, printed circuit board, or plate heat exchanger can affect the delivery system. Even if the internal thermal store heats up successfully, if any of these components fail, the delivery system will not send hot water to your tap outlets.

4. Failure of the external economy-seven time clock. This can prevent the ‘off peak’ immersion from heating overnight, leaving the internal cylinder cold.

If your thermal store is cold, it will likely be for one of three reasons:

1. Immersion heater thermostat tripped – this can be reset manually by an electrically competent person
2. External economy seven time clock failure – this can prevent the off peak immersion from heating and would need testing by a qualified engineer
3. Immersion heater thermostat or element* failure – both will be need to be tested by a qualified engineer

*PulsaCoil 2000 uses a 3kw, 14inch Incoloy Immersion heater element, operating through an 11inch rod thermostat which has a separate safety overheat manual reset cut-out.

Your PulsaCoil 2000 is equipped with a Printed Circuit Board which automatically monitors the system to ensure that it operates most efficiently. When the red fault light is illuminated, or the green light disappears (link below), it means the system has overheated and a resetting by a service engineer will be required.

There are two options for dealing with a red light fault:

1. Reset the ‘manual safety overheat reset button’ yourself by removing the front cover. This will only work for a short period of time, as it causes the PulsaCoil 2000 to continually overheat, tripping the ‘manual safety overheat reset switch’ and killing all power to the unit.

2. Call an engineer. We can come out and remove the ‘manual safety overheat reset button’ and the ‘On & Off Peak’ immersion thermostats. Both can be replaced with the new retro fit immersion heater thermostats, incorporating separate overheat safety cut-out switches.

If you find that the green light on your PulsaCoil 2000 has disappeared, but you still have hot water, it may be that the green light has simply failed. You can remove the front cover and check the Printed Circuit Board. The small red led should be flashing twice per second. If this is not the case, or if the red fault light has illuminated, call a service engineer.

If your PulsaCoil 2000 is leaking or continually losing water from the header tank, this could be for one of three reasons:

1. The immersion is leaking. As long as the immersion boss is in good condition, the immersion is a replaceable part which would involve draining down the internal cylinder.

2. Leaking pipework. Generally, if the leak is external to the cylinder then this is repairable, either by tightening or replacing damaged pipework or fittings.

PulsaCoil 2000 Leaking external pipework

3. Leaking Cylinder. Unfortunately, this would mean your PulsaCoil 2000 is beyond economical repair and you require a replacement boiler.

The PulsaCoil 2000 can either be installed on a traditional off peak system controlled via the electricity meter or via an external time clock. Time Clocks installed on PulsaCoil 2000’s are all installed aftermarket and are not warrantied or included in PulsaCoil 2000 repairs.

Know how to set your time clock correctly:

  • Economy seven timings are generally set around 12:00 through until 7:00 am
  • Economy ten timings are generally set around 12:00 through until 7:00 am as per economy seven and then an additional top up between 15.00 to until 17:00 pm

Need to order a new time clock? Take a look at the ones we recommend on our Spare Parts and Replacements page.

PulsaCoil 2000 Common Faults – Self-help video

Some PulsaCoil 2000 problems don’t require a professional repair and can be solved quickly and safely by you.

Please note that these hints and tips are provided for your interest and ease of reference only. We cannot accept any responsibility for any advice or information contained within our videos. If you are in doubt about how to fix a problem with your PulsaCoil 2000, you should always book a repair by a qualified repair engineer.

This Video on the PulsaCoil 2000 thermal store shows the basic principles of operation  including refilling the system.

After checking the PulsaCoil 2000 common faults, if you are still having an issue with your thermal store please do not hesitate to contact our office staff who can talk you through our repair options. Please call 0800 02 365 92.

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