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The only actuators that are a DIY proposition to fix (and only then if you are well versed in hobby electronics) are the modern Sunvic designs. But given that even these can have microswitch problems (occasionally) it's best to send the complete actuator for repair. Many people have...

It is quite common to find a sticking microswitch in two and three port valve actuators. This can have the effect of the valve itself being closed (thus restricting water flow) but the live feed to the boiler is maintained (via the faulty microswitch) and this keeps both the boiler firing...

Many motorised valve actuators can be repaired, it is often the best option.

Copied from another thread just to clarify issues here - the modern Sunvic valves can easily be repaired. As a scientist/engineer I mend quite a few of these as a hobby since first publishing my SeeRed webpages on Sunvic valves. The link is given above or just ask Google for SeeRed website +...

Copied from another thread, by way of explanation on this one! As a scientist/engineer I mend quite a few of these as a hobby since first publishing my SeeRed webpages on Sunvic valves. The link is given above or just ask Google for SeeRed website + sunvic valves. There are basically two...

By the way, a spring return MoMo valve is a contradiction in terms - a valve actuator is EITHER spring return (usually motor open, spring close or occasionally, for failsafe reasons, motor close, spring open) OR it is a MoMo type. A MoMo valve will stay in whatever position it was in when the...

As a scientist/engineer I mend quite a few of these as a hobby since first publishing my SeeRed webpages on Sunvic valves. The link is given above or just ask Google for SeeRed website + sunvic valves. There are basically two types of domestic motorised valves - MoMo (motor on and motor off)...