Heat setting jumps from high to low

We usually have the shower on high heat level with the temp dial around 5.

The heat level has started jumping down to low (not cold). Sometimes this happens within about 10 secs sometimes after about a minute. Can usually press the high heat level button again to get it back up but will always jump down again. Sometimes pressing high level button has no effect and it stays on low heat setting.

Occasionally all heat level lights go out and shower just runs cold.

Was thinking it was a control pcb problem but open to suggestions to fix.



Thanks

Michael
Asked 12 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 ruff 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.

If it shows low pressure after the above checks then carry out the checks below.

 The first things to check 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 open the pressure switch therefore no power will get to the elements

and the unit will show low pressure.

 

Forgetting about the temperature turn the shower from fully hot to fully cold at fully hot you should have not much more than a dribble coming from the hose and on fully cold you should have a good strong flow, if you do not have this difference then you may have a faulty flow/stabilizer  valve

 

Finally when you turn the water on, the top of the flow valve should rise, there is a plastic actuator on top of the valve this should press against a micro switch at the bottom of the PCB make sure they are properly aligned.

 

If all these are OK then you probably have a fault with your PCB.

 

The checks don’t guarantee that you have a faulty power PCB however they do eliminate just about every thing that could cause the low pressure fault and so the only thing left is the PCB.

Answered 12 years ago by Anonymous

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