Honeywell Wiring Centre 42005748-001 S PLAN

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KRP_diy

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Hi,

I think i have a Honeywell Wiring Centre 42005748-001 S PLAN setup currently, i.e. two zone valves, one for heating and one for hot water.

I had an issue last October where in there was not hot water. Got somebody to come over and have a look and he told me that the motorised head was not working and need to replace the valve and got the valve replaced and the hot water was fine.

Couple of weeks ago since the temperature is on the rise and the heating is turned off, figured that every time the hot water came on the radiators were also heating up and was getting a bit uncomfortable and thinking it was a reminiscent of the previous fix called the guy who fixed the issue previously and the guy came around and told me that the motorised valve for heating also need to be replaced as it is not closing properly and letting the hot water run into the radiators.

Got the valve replaced but that did not fix the issue and the guy who fixed it is not returning my calls (trusted the guy and paid in full).

Anyways, I have done some troubleshooting at my end and the thing is every time the thermostat calls for heat for hot water both the valves are energised but when the thermostat calls for heat for heating only the heating valve is energised so i am guessing it may be to do with wrong wiring.


I have attached the picture of the current wiring can somebody please have a look and comment.

Many Thanks.
 

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its interesting the room stat wires appear to have been cut off and it bypassed.

that would certainly help keep the heating off!

or are you sure the timer has the CH set to off ?
 
Hi, the room stat wires have been indeed cut off as i have a hive system installed recently.

I have the heating turned off but have the hot water set to come on every morning at half past 5 for half hour at this time the radiators also heat up even though heating it turned off at the programmer.
 
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This doesn't look right,
Orange is connected to grey live when the valve opens to switch on boiler (no white on two-port valves) so I don't see how it can work properly.
What effect that has on other parts I am not sure.

upload_2019-7-27_17-43-0.png
 
The HW valves orange wire is in the terminal marked white.


Edit, too slow. White is obviously heating on for a 3 port valve but I can't work out what effect that will have with the various links cut in this unit.
 
In that case when the HW valve opens it will send power to the CH valve live motor terminal (brown) and in turn switch on the heating. It can't be switched off after this as this is after any thermostat (although yours has been bypassed.)

It is likely that moving the orange wire to the orange terminal will correct the problem.
 
Last edited:
Another thing to try is to disconnect the brown wire from the CH valve wires on the left.
If the heating still comes on it’s a mechanical issue.
If the heating says off it’s electrical.
 
Echo the husky said:
In that case when the HW valve opens it will send power to the CH valve live motor terminal (brown) and in turn switch on the heating. It can't be switched off after this as this is after any thermostat (although yours has been bypassed.)

It is likely that moving the orange wire to the orange terminal will correct the problem.
Click to expand...


Thank you very much for the advice. I moved the orange wire and everything looks good now. The hot water isn't energising the heating motorised valve.

I should have checked on this forum earlier before getting the person out to fix the issue as i lost £200+ for changing the motorised valve and draining the system which was unnecessary as it turns out to be.
 
Many thanks for everyone for the quick response. Really appreciate it.
 
KRP_diy said:
I should have checked on this forum earlier before getting the person out to fix the issue as i lost £200+ for changing the motorised valve and draining the system which was unnecessary as it turns out to be.
Click to expand...
It really bothers me the number of 'professionals' replacing parts without actually diagnosing the fault. I used to work in appliance repair before I was an electrician, I don't recall ever 'part swapping' instead of logically attempting to locate a fault.

Of course the valve could have actually had a mechanical problem too, but it's rather poor to not sort the fault completely before leaving.
 
The reason i felt the replacement of the valve was unnecessary because the problem for which the valve was replaced was not resolved.

It breaks your trust because i called this person the same evening (job was done in the afternoon), sent a text message, emailed, called multiple times after that and left voice messages but he did not bother to respond which does not make sense to me and i made the payment right away after the job was done based on trust. This experience makes it hard to trust the good people out there.
 
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