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Need a user guide / instruction manual for a Honeywell Smartfit T8677A1008 thermostat

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  • Jan Dixon Nov 24, 2011

    just moved into a house with a smartfit central heating system and no manuals how to program to timer for heating please help with the instruction manual

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Posted on Jan 02, 2017

SOURCE: I have a honeywell smartfit

I had exactly the same problem. F4 code says the control valve has jammed --- but it hadn’t.

I ended up having to swap out the room controller and the base unit (I bought the pair since it was winter and I couldn’t ‘eff’ about)

On investigating (well, you have to don’t you?) I could find no obvious fault but did notice that a large electrolytic capacitor was across the actuator motor.

Since these things work by reversing the supply polarity to the motor to drive the actuator one way and the other it strikes me as strange that a polarity sensitive component, one that must be always connecter positive to positive, is used in the way that it is.

Bottom line, tough luck, mate. Replace the units.

Posted on Jul 31, 2008

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Don't think it's a Honeywell product

http://www.gotoplumbing.com/uploads/Ethos-3654c.pdf

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