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My thermostatic shower tower starts running hot ok but after a few minutes starts to run cold, it also pulses occasionally. If I switch the shower off and then back on it eventually runs hot again for a few more minutes. When I check the Baxi combi boiler the DHW light isn't lit, as if the shower has stopped calling for water (when pulsing the DHW light appears to pulse also). I can't imagine its a boiler fault because turning a tap on means the boiler runs continually. Anyone have any ideas?
Hi its sounds like the thermostatic cartridge in the shower is faulty and it will need replacing. If you let me know the make and model I may be able to send you the link to costs for this item. Best regards Brian