Hi all - hope you can help me with this query. I'm not a sparky, but reasonably competent at diy.
I had a humidistat extract fan in the bathroom (model EV 4HT), which developed a fault in that the motor was working intermittently (went on and off every couple of seconds). The fan was about 5 years old maybe. Anyway, I got a replacement fan, and thought it would be easy enough to just replace and wire it exactly as before.
So I did this, and the fan works fine, without that intermittent motor problem. However, the fan used to come on when the light came on, and then go off a minute or two after the light was switched off. NOW, the fan runs all the time, regardless of what the light switch is set to.
There is a on/off switch for the extractor fan itself, and the fan comes on when that switch is on, and goes off when that switch is off. The wiring is 3 core plus earth, and with a tester I can see that the switched live (yellow) is delivering current only when the light is on. I thought maybe there was a fault with the replacement fan, so as an experiment I put in the old fan again, it it too showed the same symptoms (ignores state of switched live).
View media item 56797
A couple of additional notes. I have put some sleeving around the earth, and tried as best I can to shove it into the clear plastic (terminal block?) thing that looks like a small telephone plug that hopefully you can see in the attached photo. I have also adjusted the two controls (one of humidity level and one for duration) in every direction to see if it had any affect (it didn't). Finally, the limited documentation that comes with the fan suggests it has two modes (automatic, based on humidity level, and manual, based off the switched live) - I can see no way to switch between the two modes, nor indication in the documentation.
SO - any help or suggestions would be appreciated. Many thanks in advance.
David.
I had a humidistat extract fan in the bathroom (model EV 4HT), which developed a fault in that the motor was working intermittently (went on and off every couple of seconds). The fan was about 5 years old maybe. Anyway, I got a replacement fan, and thought it would be easy enough to just replace and wire it exactly as before.
So I did this, and the fan works fine, without that intermittent motor problem. However, the fan used to come on when the light came on, and then go off a minute or two after the light was switched off. NOW, the fan runs all the time, regardless of what the light switch is set to.
There is a on/off switch for the extractor fan itself, and the fan comes on when that switch is on, and goes off when that switch is off. The wiring is 3 core plus earth, and with a tester I can see that the switched live (yellow) is delivering current only when the light is on. I thought maybe there was a fault with the replacement fan, so as an experiment I put in the old fan again, it it too showed the same symptoms (ignores state of switched live).
View media item 56797
A couple of additional notes. I have put some sleeving around the earth, and tried as best I can to shove it into the clear plastic (terminal block?) thing that looks like a small telephone plug that hopefully you can see in the attached photo. I have also adjusted the two controls (one of humidity level and one for duration) in every direction to see if it had any affect (it didn't). Finally, the limited documentation that comes with the fan suggests it has two modes (automatic, based on humidity level, and manual, based off the switched live) - I can see no way to switch between the two modes, nor indication in the documentation.
SO - any help or suggestions would be appreciated. Many thanks in advance.
David.
