Radiator is always hot even with CH OFF!

[DavidFox]

Hi all,

These few days, finding the radiator hot. The programmer shows CH OFF. Checking the mid-position valve (with A3MID Acuator head) finds that the pipe to the radiator (connecting to Port B) is hot.

Removing the cover of the head so I can see the motor, springs, etc. and did the following:

(1) I turned off the power (of the entire house, as not sure which switch is for the main system controlling the boiler/heating system. Is it the one near the Programmer). Follow the tips given at: //www.diynot.com/forums/viewtopic.php?t=287357, by pushing the lever below the actuator across the slot, it seems hat the the valve is not sticky.

(2) Got the partner to turn on/off power while I was watching the Acuator head. No single slight movement seen or heard. From the Programmer, On/Off both/either HW or CH seems not 'activating' the head at all.

So, problem with the Acuator? Advice further check such as electric test (using meter)?

Thanks.

 

[AngelesPlumbing]

Change new 3 port valve...its letting by to heating and it might be the rubber ball is damaged

 

[twgas]

Port b is normally connected to HW not CH

 

[leakydave]

Ditto twgas... Port B is Hot Water. I was taught B-Bath [hot water]

 

[picasso]

What make and model of 3 port do you have ?

 

[DavidFox]

Change new 3 port valve...its letting by to heating and it might be the rubber ball is damaged

Thanks. So, the problem is with the valve, not the head (Actuator)? I thought the valve is not sticky...

 

[DavidFox]

What make and model of 3 port do you have ?

Thanks. Same as this: http://www.amazon.co.uk/Tower-Components-A3MID-Position-Actuator/dp/B00HZKLMN2

Shall i buy one to replace? If so, just off the main power, no need to drain system, right?

 

[ALCPlumbing]

What make and model of 3 port do you have ?

Thanks. Same as this: http://www.amazon.co.uk/Tower-Components-A3MID-Position-Actuator/dp/B00HZKLMN2

Shall i buy one to replace? If so, just off the main power, no need to drain system, right?

If you need to replace the whole valve unfortunately you will have to drain down.

 

[feynman]

I once plumbed a bathroom radiator/towel rail feed from before the 3-way divertor valve, so that the towel rail was warm whenever the boiler was on - CH or HW or both. This kept the bathroom and the towels nice and dry and warm, which earned many brownie points from her indoors! Also cheaper, because if you just wanted a shower you only needed to put HW on to get a shower and a warm bathroom.

(thermostatic valve on the bathroom rad too)