Long cold running on startup

Why does out T80si shower always run cold for about one minute, when it is used by a second person immediately after the first person? If a time elapse of about 10/15 minutes is allowed, the shower will then run hot almost immediately.
Asked 8 years ago by John
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

Answered 8 years ago by Anonymous

Thank you for your reply. I will turn up the main water shut off valve, which is not fully open. The reason for this is so that the toilet cisterns and the main cold water tank supplies are not filled at a too rapid rate.
However, I may have turned the main valve down too much.
I would add that the water from the shower unit is always more than ample, but hopefully a slight pressure increase will be all that is needed.
Thank you again,
J. Maynard

Answered 8 years ago by John Maynard

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