Honeywell Zone Valves

[Terry]

Central heating system with 2 off 22mm Honeywell Zone Valves, 1 for heating and 1 for hot water.

The hot water valve lasts about 6 months and then stops opening sufficiently so that the operating arm fails to hit the microswitch to switch on pump.

Have changed the head twice and valve twice, but same cycle repeats.
Fault can be cleared temporarily by removed operating head on valve and cycling valve manually.

The heating valve is installed next to the hot water valve in the same orientation and never suffers from this fault.

Any ideas please

 

[stevetheplumber]

if you still have the failed ones you could try honeywells maybe they could give an answer
are you sure water is running in the right direction through both valves
its rare for what you describe to happen as these are normally quite reliable pieces of kit and usually its the motor that packs up first the motor can be changed cheaper than a complete head

 

[gasmarc]

maybe try a stronger motor apparently there is two types

 

[Terry]

Valve direction and flow correct.
Interested in stronger synchronous motor as that appears to be the issue, did not know there was more then one type; any details?

 

[gasmarc]

its in my brain somewhere I heard there are 2 types of motors one light duty other one heavy , sorry no more info maybe call honeywell

 

[aggis]

Hi, Swop the whole valve it's the valve mechanism thats burning out the syncron motor.

 

[SafeGasInstall]

do you have a auto bypass ,this helps to prevent damage to all parts of the central heating