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Thanks, Onetap and 45yearsagasman. To clarify what I was asking... I don't think my Sunvic actuator is faulty as such, just that it's not up to the job. So I don't think I'm looking for a repair. :( [I assume that the gear mechanism by which it spills its torque (rather than stalling) is...

The Problem The 2-port valve and Mo-Mo Actuator on my Central Heating system often stick when moving between the “open” and “closed” positions. [Actually, the actuator doesn’t stall – it simply clicks as the gears jump when there isn’t enough torque to turn the valve shaft.] System...