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I have managed to resolve the problem by replacing the "Honeywell Smartfit W4672A Base Unit". I ordered it online, it was with me 3 days later and took about 30 minutes to do the job. Thanks everybody for their feedback and suggestions. I'm off to have a hot shower now... :-)

Thanks for all your feedback and help. I'm just trying to source a new Base Unit. Looks like I might have to order one as none of the local shops have them in stock. I also spoke to Honeywell technical support on the phone and they suggest that the most likely solution is to replace the...

Thanks for your speedy response - all starting to be a bit clearer now! The first thing I did was replace the actuator with a brand new one however it does not appear to get any power as it doesn't 'drive' or show any sign of powered life. It is possible I have bought a dud however unlikely...

Thanks for the reply. Have seen the fault codes in the instructions however I'm having trouble understanding some of the terminology. a. The actuator seems to definitely be fitted to the 3-port valve but will check again. The F04 error appeared before and after I replaced the actuator...

My Honeywell boiler as of today is presenting me with a F04 (F4) error. I've replaced the actuator with a brand new one however this has not resolved it. From what I recall the actuator should receive power and move to control the flow of water; however I don't think it is actually getting...