S plan blowing fuses

J

jpmc

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Hi
I have run out of ideas so hope that someone here might have come across this problem before.
Basically I have fitted a new valve on the heating side and now the system runs fine for about an hour and then blows the fuse in the spur. I cannot find any problem in the wiring. The valve base was replaced by someone else (don't think it was a plumber) I am a sparky and I wired the new actuator head. It is possible that the new valve base was fitted the wrong way round but I don't think that should affect anything

Any suggestions would be appreciated
 
jpmc said:
Hi
I have run out of ideas so hope that someone here might have come across this problem before.
Basically I have fitted a new valve on the heating side and now the system runs fine for about an hour and then blows the fuse in the spur. I cannot find any problem in the wiring. The valve base was replaced by someone else (don't think it was a plumber) I am a sparky and I wired the new actuator head. It is possible that the new valve base was fitted the wrong way round but I don't think that should affect anything

Any suggestions would be appreciated
Click to expand...

Not a very good one though.
If it was ok before it sounds like you have caused the problem.
It is common to find blue and G/Y wires used as l or s/l but not sleeved.
Have you operated the controls manually to see what is causing the s/c
 
never go by wire colours on a heating system, sounds like you have wired a NC contact to an earth, or a Neutral and once it gets to temp it switches over and causing a short
 
Thanks for replying Terrywookfit. I have turned the stats up and down manually which did not blow the fuse. I cannot find a s/c and if there was a s/c I would expect the fuse to blow immediately. Fuse blowing after an hour causes me to think of an overload rather than a short. I am back to take another look tomorrow.
 
jpmc said:
Thanks for replying Terrywookfit. I have turned the stats up and down manually which did not blow the fuse. I cannot find a s/c and if there was a s/c I would expect the fuse to blow immediately. Fuse blowing after an hour causes me to think of an overload rather than a short. I am back to take another look tomorrow.
Click to expand...
It is lowing because the circuit is getting to satisfied and switching over you have fecked the wiring up
 
Have you checked leaking pump valve not dripping into motorised valve
 
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