I've just fired up my central heating system after having to re plumb the downstairs due to broken pipes in the concrete floor. It's a Y plan system with a Danfoss HS3 valve.
When I turn it on, all is good for around 30 seconds to a minute, then the valve actuator starts clicking and gets hot on the top. This also makes all the electrical outputs pulse on and off so the boiler and pump both switch off. I dropped the actuator off, the valve turns freely, and the same thing happens with the clicking and pulsing with the actuator off the valve.
I had a brand new spare that I bought a while back as I heard these frequently pack up, so I wired up the new actuator and put it on the valve. Exactly the same thing happened again, it ran OK for about a minute and then started clicking and pulsing.
When the override switch is on, everything runs fine, but obviously there is no proper control so it's not ideal. Any suggestions anyone? It seems strange that both have done exactly the same thing. I have checked all electrical connections for tightness and the voltages etc are OK.
Many thanks
When I turn it on, all is good for around 30 seconds to a minute, then the valve actuator starts clicking and gets hot on the top. This also makes all the electrical outputs pulse on and off so the boiler and pump both switch off. I dropped the actuator off, the valve turns freely, and the same thing happens with the clicking and pulsing with the actuator off the valve.
I had a brand new spare that I bought a while back as I heard these frequently pack up, so I wired up the new actuator and put it on the valve. Exactly the same thing happened again, it ran OK for about a minute and then started clicking and pulsing.
When the override switch is on, everything runs fine, but obviously there is no proper control so it's not ideal. Any suggestions anyone? It seems strange that both have done exactly the same thing. I have checked all electrical connections for tightness and the voltages etc are OK.
Many thanks