HONEYWELL ZONE VALVE Heating Stays On
| CONF | DIAGNOSIS | PART MATCH | ACTION |
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91%
CONF
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Honeywell Replacement Powerhead (Actuator)
The Powerhead contains the return spring and the microswitch (end-switch) that signals the boiler to fire. When the heating stays on, the spring has either failed to retract the paddle or the microswitch has welded shut/stuck, maintaining the electrical circuit to the boiler. Replacing the entire head resolves both mechanical jamming and electrical switching failures without needing to drain the plumbing system.
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CHECK PRICE |
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5%
CONF
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Synchron Replacement Motor
The Synchron motor drives the gear sector to open the valve; if the motor's internal gearing or the external gear train is seized or unable to spin freely in reverse, it will prevent the return spring from closing the valve. Replacing the motor is the most granular fix for a jammed gear-train assembly within the actuator.
SKU: 802360JA
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CHECK PRICE |
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4%
CONF
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Honeywell 2-Port Zone Valve Body
In cases where the internal rubber paddle has swollen or the metal spindle has seized due to system debris (sludge/limescale), the actuator cannot force the valve closed even if the spring is functional. This is confirmed if the actuator is removed and the manual spindle cannot be turned easily with pliers.
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CHECK PRICE |
DIY Repair Guide
Watch exactly how to replace the Honeywell Replacement Powerhead (Actuator).