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Reset button on honeywell smartfit 24hr heating/hot water control not working

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5 Suggested Answers

22yooper
  • 828 Answers

SOURCE: My central heating system comprises

You could possibly have an ignition problem. The controller will go into a lock-out condition if flame is not established. Turning the temperature control down and then back up may be serving to reset the control system so it tries again.

Posted on May 22, 2008

  • 230 Answers

SOURCE: my clock on my honeywell

Before replacing the unit try replacing the batteries. After you replace the batteries push the run program button and see if the system comes back to life:)

Posted on Jun 27, 2008

  • 1 Answer

SOURCE: keston c40 honeywel 9400c programmer

do a s plan plus and buy a poly plumb roomstat combined programer with built in relays as you require the relays to stop back feed! simple!

Posted on Jul 23, 2008

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

  • 1214 Answers

SOURCE: Honeywell Smartfit Control Unit

You need to either call an electrician if your unable to, or do not have the knowledge to troubleshoot electrical circuits, or, get a multimeter and see that power is coming to the furnace/heater.

Reply back what type of heating unit you have (gas or electric), any other symptoms you've observed (including has the system ever operated before, and what changes may have been implemented to cause it not to operate) and the model, and we can be of more help to you.

Posted on Jan 22, 2009

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Honeywell Smartfit Control Unit


You need to either call an electrician if your unable to, or do not have the knowledge to troubleshoot electrical circuits, or, get a multimeter and see that power is coming to the furnace/heater.

Reply back what type of heating unit you have (gas or electric), any other symptoms you've observed (including has the system ever operated before, and what changes may have been implemented to cause it not to operate) and the model, and we can be of more help to you.

Jan 22, 2009 | Heating & Cooling

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I have a honeywell smartfit but it keeps coming up with a F4 error


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.

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Before replacing the unit try replacing the batteries. After you replace the batteries push the run program button and see if the system comes back to life:)

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This worked for me. Good luck.

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