Mira Sprint 9.5 running cold

My Mira Sprint started to run cold. Plenty of flow but not heating the water. I replaced the Thermal Switch and this seemed to solved the problem for a couple of weeks. Now it is running cold again. Following your excellent video I have checked the TCO for continuity and all is well. I also checked the TCO I had removed and that is OK too. So while that isn't the problem, changing it did cure the problem for a while. I am wondering if it is a micro switch. What do you think? Thanks and best wishes.
Asked 9 years ago by Anonymous

The main reasons for it running cold is a TCO with no continuity.


The other possibility is the flow valve failing or low pressure, not allowing the pressure switch contacts to push up enough to press against the micro switches  that allow the power through to the elements.


The other thing is a faulty element however if it is a faulty element then there is usually still some heat in the water.

Answered 8 years ago by Anonymous

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