Manrose bathroom fan timer not working

[osincy]

Hi All

My first post and I hope you can help.

We have just replaced an extremely old, nasty and noisy fan with a nice, new quiet Manrose QF100 timer model.

Brilliant, quick, easy installation. Unfortunately the timer does not seem to work and it does not turn itself off and we have to physically turn it off using the ceiling mounted pull switch. Then, of course, we have to remember to put it back on when it is needed.

Any help would be appreciated. Have we (my husband) done something wrong or do you think the timer is actually not working and it needs returning?

Thanks in advance.

 

[Iggifer]

You should have a live and switched live, chances are they're the wrong way around

Pop off the cover and have a look, there should be a Neutral, then two more terminals, marked L or Live and SL or Switched Live

Swap the two lives around and see what happens.

 

[ban-all-sheds]

Getting them wrong causes (usually causes?) the reverse behaviour - no run on, because the SL is (is usually?) just a trigger, not a supply, and the permanent live is what powers the fan. So even if the trigger is permanently set, if there's no live for the fan it stops running.

 

[ban-all-sheds]

Unfortunately the timer does not seem to work and it does not turn itself off

What's the longest you've left it?

 

[JohnW2]

Brilliant, quick, easy installation. Unfortunately the timer does not seem to work and it does not turn itself off and we have to physically turn it off using the ceiling mounted pull switch. Then, of course, we have to remember to put it back on when it is needed.

Exactly how have you connected it, and what functionality are you wanting to achieve? Do you want it to come on with the light and then over-run for a period after the light is switched off? What is this ceiling-mounted pull-switch - is that the light switch, or a separate switch just for the fan?

Kind Regards, John

 

[JohnW2]

Getting them wrong causes (usually causes?) the reverse behaviour - no run on, because the SL is (is usually?) just a trigger, not a supply, and the permanent live is what powers the fan. So even if the trigger is permanently set, if there's no live for the fan it stops running.

Indeed - that's how every time fan/timer module I've ever come across works. The only way I can think of to get it to run continuously would be to link the L and S/L - and if one did that, it (and any associated light) really would be on continuously, regardless of switching of the S/L.

However, per my recent post, I'm not yet sure that I fully understand the OP's setup.

Kind Regards, John

 

[osincy]

Husband will be home this evening, I will check exactly the connections then.

The fan is not connected to the light. The pull switch (came with the house with the old fan) switches the fan on and off. The old fan was switched on all the time and had a humidity sensor and came on and went off accordingly.

We assume with the new fan with a timer control (set at 15 minutes) we switch the fan on with the pull switch and it would go off on its own because of the timer.

It stayed on all day, say 8 hours or more.

We are wondering if we should ignore the pull switch and just connect to the lights. So lights on, fan comes on and stays on until 15 minutes after the lights are switched off.

 

[JohnW2]

The fan is not connected to the light. The pull switch (came with the house with the old fan) switches the fan on and off. The old fan was switched on all the time and had a humidity sensor and came on and went off accordingly.

If you've just connected the new fan the same as the old one (but without the humidistat), then what you are experiencing would be the expected behaviour - i.e. the switch would just switch it on and off, and when on it would stay on until you switched it off.

We assume with the new fan with a timer control (set at 15 minutes) we switch the fan on with the pull switch and it would go off on its own because of the timer.

As above, that's not how it works. If the fan were wired 'correctly' (with a 'permanent live' connection, as well as the 'switched live' from the switch) it would stay on all the time the switch was on, AND would stay on for 15 mins after it was 'switched off' (functionality designed for when it is controlled by a lights switch)

It stayed on all day, say 8 hours or more.

As above, with the arrangement I think you're describing, it would stay on for ever, until the switch was switched off.

We are wondering if we should ignore the pull switch and just connect to the lights. So lights on, fan comes on and stays on until 15 minutes after the lights are switched off.

That is the standard arrangement, and how they are meant to work. As above, to do that would probably require some additional wiring, because it requires the fan to be provided with a 'permanently live' feed as well as the 'switched live' from the light switch.

Hope that helps.

Kind Regards, John

 

[ban-all-sheds]

We assume with the new fan with a timer control (set at 15 minutes) we switch the fan on with the pull switch and it would go off on its own because of the timer.

Ah - no.

What they are supposed to do is to carry on running for a time (e.g. 15 minutes) after they are told to switch off.

They are supposed to have a permanently live supply, and one which is switched, and they run on for a while after the switched one goes off. Traditionally they are wired to the light in rooms with no window, as you'd always need to turn the light on when you go in there. That is not always the best way though - you might not need the fan to come on (e.g. you've only gone in there to clean your teeth), you might not want it to come on (e.g. you've got up in the night for a pee), or conversely you might want the fan but not the lights (e.g. you have a full-sized window and it's a bright day).

If you are happy with using a separate switch for the fan (it might take a while to get into the habit of turning it on and off, but you will get into that habit), then if you can replace the cable which runs from the switch to the fan you can stick with the switch you have and have the fan do what it should.

 

[osincy]

Thanks ban-all-sheds. Just showed your reply to my husband and he understands what he needs to do.

We do have a window in the room and didn't really want the fan coming on with the light. And, as you say, we sometimes (getting up in the night) don't want the fan to come on.

Thank you so much for your help.

I hope, tomorrow, to have a properly working fan