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PulsaCoil PCR Common Faults

PulsaCoil PCR Common Faults

PulsaCoil PCR Common Faults

Like the PulsaCoil BP, the inside workings of PulsaCoil PCR have gone back to basics, all the electronic circuitry has been removed, It now operates in the same way as the original Pulsacoil with only two Immersion elements and a simple mechanical blending valve, very little that can go wrong! The store is heated via the bottom Immersion, usually overnight on an economy tariff. A top Immersion is supplied as a backup or as a boost facility that can be operated during the day.

If you have a Pulsacoil PCR and it is not producing any or only very little hot water then it could be likely that there is a fault with the Immersions heaters. If the temperature fluctuates or the pressure is reduced then it is could be that the blending valve is clogged with limescale or damaged.

PulsaCoil PCR Common Faults

As this is a simple system with no electronics, here are the list of common faults on the PulsaCoil PCR:

PulsaCoil PCR Low water Level

The header tank for PulsaCoil PCR is located on top. A float valve may be connected to the main water supply to fill it. (When there is NO mains connection, there is typically a tap on the wall nearby that the user can use to manually fill the container.) As there is no float valve to top it off, the user must occasionally manually add water to the thermal store as it is continuously lost through evaporation and/or leaks.

A PulsaCoil PCR will ultimately become inoperable due to low water levels in the header tank, once the tank is empty, the water level inside the thermal store will also deplete. Hot water performance will be impacted once the heat exchanger coil is no longer completely submerged in the thermal store water. The best solution is to check the header tank water level and fill it to the waterline embossed into the cistern’s wall.

PulsaCoil PCR Failed Immersion Elements
The appliance does not heat up. By checking the heating element’s resistance, a simple diagnosis can be made. A correctly working element will read a steady 18 Ohms.
PulsaCoil PCR Failed Thermostats
As they age, the immersion heaters originally manufactured by Shel leak in the thermostat sensor pocket. Our engineers frequently see water coming out of the copper tube that houses the thermostat sensor.
This allows water to enter the electrical connections on the heating element, tripping the electricity supply, which is obviously unsafe. The entire immersion heater and thermostat must be replaced.
PulsaCoil PCR Thermostatic Blending Valve Failure
In places with hard water, scale can contaminate the thermostatic blending valve. Over time the internal components can also become brittle. These internal components malfunction, resulting in the blender valve only supplying lukewarm water to the taps. The issue is resolved by replacing the blending valve.
PulsaCoil PCR Scaled Internal Coil
In some places, scale, created by hard water, accumulates on the internal plate heat exchanger. This causes the maximum water temperature to gradually drop, and in the latter stages of scaling, the flow rate from the taps will also decline. The solution is to either replace the boiler or try to chemically descale the current heat exchanger.
PulsaCoil PCR Time Clock
Typically, an Economy Seven rate energy supply is used to power a PulsaCoil. An Economy Seven timer will have been installed if the unit does not have a separate off-peak power supply. Even if the indicator lights on the timer indicate that power is being delivered, these tend to stop working after a few years and no longer power the immersion heaters. These timers are simple to replace.

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