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How can I loosen the control on a Drayton TRV?

I have a Drayton TRV4 which is stuck on heat setting 2. I cannot turn the control knob to increase or decrease the setting. How do I remove the valve to apply WD40 to the body without flooding the place?

Barry Cockerell
January 2010
DraytonHeating, Home Heating Systems
there will be a knurled nut directly below trv head, you need to loosen that to take the head off. you can buy just a head for these as far as i know for aroung £10 in case you can't get it loose.

Ian
January 2010
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Drayton Digistat+2 RF?
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Digistat Drayton connection?
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drayton room thermostat display screen is blank?
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how to replace batteries in my Drayton Digistat RF1?
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how can i fix thermostat?
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drayton digistatrf1 wireless system?
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Drayton sm2 timeswitch?
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Drayton Digistat RF2 Wireless system?
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Help to fix a room thermostat, please?
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is it possible to repair a non digital Drayton SM2 timer?
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Drayton Digistat +RF Model RF-601?
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How can I override code I can't remember?

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Drayton Digistat 2Drayton Digistat 3

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Mend Home Heating Systems
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Free repair help for Drayton home heating systems