low pressure light water freezing or scalding

The low pressure light comes on several times while in shower and water turns freezing, dribbles and shower makes a noise like a boiling kettle. The only way to stop this is to turn it to hottest setting and basically get scalded and move out of way until pressure light turns off and temperature is restored. The shower dribbles water pathetically as there is no pressure and it has to be set no lower than 6 or there is no hot water at all, but it is too hot on 6 in summer. Could it be the thermostat or some kind of cut off switch or is it a new shower I need? Had it around 5 years and only had this problem for around one year.
Asked 8 years ago by Anonymous

The things to check first are:

1 That the main valve coming into your house is fully open.

2 Then check that the valve on the line to the shower is fully open.

If these valves are not fully open then there may not be enough water getting to your shower to cool it properly the overheat safety device will turn the power off until it cools Then it all starts again


Make sure that the shower head is clean and clear, that the hose isn’t kinked (this can happen just behind the hand set where it is difficult to see) also check the inside of the hose although it can look OK on the outside it could have collapsed internally

The other possibility is a faulty flow/stabilizer valve not allowing the correct amount of water into the shower.

A rough check is to remove the shower head turn temperature control to fully hot the water coming out of the hose should be a bit more than a dribble then turn to fully cold and it should be coming out at full flow.

If there is not much difference between the two then you could have a faulty flow valve.

Carry out this check after you check the inlet valves.

Answered 8 years ago by Anonymous

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