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It's most likely underneath. On a 60e it's just to the left of the temp control knob.

Rung Sunvic; they say the valve is too new (2.5 years old in my case) to sell just the actuator. But obviously old enough to be 18 months out of warranty! Any recomendations on a reliable brand of 3 port valve? The original one (blue case mounted on the side of the T, not the top, can't...

I think it depends on the voltage of the system; if it's not mains voltage it should be OK.

I'm having what sounds like exactly the same problem with the same actuator, a Sunvic SDM 1901 (installed in May 2004). HW works on demand every time. If CH is demanded while HW is being demanded valve goes to mid position and everything works. However, once HW is no longer being...