PulsaCoil 3 Common Faults

Although many users might assume that a PulsaCoil 3 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 3 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.

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 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.

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.

Your PulsaCoil 3 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 3 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 3 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 3 is leaking or continually losing water from the header tank, this could be for one of three reasons:

1. The immersion is leaking. This 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.

3. Leaking cylinder or header tank. Unfortunately, this would mean your PulsaCoil 3 is beyond economical repair and you require a replacement boiler.

 

The PulsaCoil 3 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 3’s are all installed aftermarket and are not warrantied or included in PulsaCoil 3 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 3 Common Faults – Self-help video

Some PulsaCoil 3 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 3, you should always book a repair by a qualified repair engineer.

This Video on the PulsaCoil 3 thermal store shows the basic principles of operation  including refilling the system.

After checking the PulsaCoil 3 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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