Issue with APT heating switch - clock not working properly

Username202401 · 13-01-2024 05:44PM #1

Hi all,

I would appreciate some advice.

I recently put in an APT timer switch.

The orange indicator light stay. The switch turns the heating off and on no problem.

But the 24 hour timer only works in the ON position ie when the heating is on which isn't really great.

Is this a faulty switch or some other issue at play?

Would appreciate any advice

monseiur · 13-01-2024 08:45PM

These APT timers have 3 settings OFF ON CLOCK To set CLOCK push slide switch to CLOCK and set time you want boiler to kick in. Say you want it to kick in at 7 am and switch off at 9 am - push in all the pins between 7 & 9. (The orange light will also come on at 7 am and switch off at 9am) Current time must be at black arrow on right hand side.

Username202401 · 13-01-2024 09:29PM

https://www.boards.ie/discussion/comment/121612085#Comment_121612085

Thanks for your reply.

The issue is the 24 hour timer doesn't turn when sent to CLOCK or OFF. The timer only changes when it is on ON

Wearb · 13-01-2024 09:38PM

Either wired wrong or broken timer.

CrazyEric · 14-01-2024 01:00PM

https://www.boards.ie/discussion/comment/121612317#Comment_121612317

Sounds like it is wired it wrong. If the live in/live out are reversed then the clock will only get power when the OFF/ON/Clock switch is in the ON position.

Do you know an electrician to have a quick look at it? It is usually better to not mess with electrickery as it hurts when done wrong.

monseiur · 14-01-2024 08:18PM

https://www.boards.ie/discussion/comment/121612275#Comment_121612275

Undo the wiring and start again, this time follow the ~~destructions~~ 🤣 oops... I mean instructions

jonjoe dev · 09-10-2024 07:47PM

I'm having the same issue with my new timer. Unfortunately the wires to it are brown, red and 2nr blue. I'm not entirely sure whether the red or the brown are the live (although from checking a plug socket the brown is connected to the live terminal).. the clock only worked in the clock setting but then when the timer turned the heating off, the clock also stopped. I switch the brown and red cables about and the clock was then working but when I switched the heating on there was a loud pop.

20241009_192404.jpg

Lenar3556 · 10-10-2024 12:31AM

https://www.boards.ie/discussion/comment/122702219#Comment_122702219

The symptoms you describe initially is consistent with the live in and out being reversed.

Simply swoping the brown and red in the photo shouldn’t give rise to any popping!. My guess is that the the brown is the supply and red is going to the burner - so it looks correct as it is.

hurlaway · 10-10-2024 01:45AM

Changed 2 clocks in my own house at the weekend terminal no. Is neutral (blue) look at the bottom of the clock and it will tell you the connection's

hurlaway · 10-10-2024 01:46AM

Sorry terminal no.3

jonjoe dev · 10-10-2024 11:38AM

Something definitely blew, I think the power intermittently cut also. the switch not working at all now and even the old one wont work. Anyway have organised an electrician. Will let yous know the outcome...thanks

jonjoe dev · 15-10-2024 08:43AM

What must have happened was the neutral wires came out causing it to blow. I changed the fuse next to the timer and wired up again. Working now. I had the 2 live wires mixed up on the first install. Red was to the burner . Thanks for your help

cubix · 21-01-2026 09:49PM

Having a similar issue to OP. Apt timer will bring the boiler on fine when in the on position. The timer 24hr clock is not going around so not keeping correct current time so unable to use in clock setting. I got a replacement thinking the clock was faulty but same issue with replacement , ( like for like Apt). With mine I have two neutrals/ blue, two browns/ I'm thinking lives and a black which I believe is the switched feed. The switched feed is in the live out.

Can someone in the know confirm if I disconnect all and only wire in the supply side of the neutral & live ( brown) is this enough to confirm clock is working & should be keeping the correct time

Lenar3556 · 22-01-2026 06:08PM

https://www.boards.ie/discussion/comment/124168921#Comment_124168921

The new one could be faulty, quality of them in recent years has gone down hill.

Yes - If you have live and neutral present on supply, the clock should keep time. Get a multimeter and confirm you have 230V between supply live and neutral.

A missing neutral will stop the clock, but manual ‘on’ operation will still work, so that needs to be confirmed with a meter.

Issue with APT heating switch - clock not working properly

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