Hot then tepid water
Regarding the temperature fluctuation or cool running it could be a faulty cartridge or needing serviced however to check this, see if you can get hold of the hot supply pipe before it enters the shower or perhaps as it leaves the boiler.
If when holding this pipe the temperature fluctuates or goes cool then the problem is not with the shower but more likely with the boiler as the shower can only deliver what the boiler sends to it. #
Disregard the temperature at the taps as they have a different flow rate.
If the hot supply is OK then my advice would be a strip down clean lube and fit a service kit
http://www.showerdoc.com/sirrus-valve-service-kit-sk1500-1
This video shows how to test a thermostat.
http://www.youtube.com/watch?v=x5f_E91IkKk
Answered 11 years ago by The Shower Doctor
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