Drayton Tempus 7 Problems

[richf3jones]

Hi all, I wonder if anybody can help.

I recently changed my switchmaster mechanical thermostat for a honeywell digital battery operated one.
I had Live Neutral and an earth and the live/neutral just went into A & B.
During this process I managed somehow to short the earth to the C terminal as I tried to tuck it out of the way instead of terminating safely which I`m embarrassed about.

When i did that the RCD tripped on my main consumer unit and blew the fuse in the programmer supply so I corrected the earth issue (made it safe) and fitted a new fuse.

On powering back up the thermostat is controlling the heating irrespective of the programmer being on off auto boost etc and the hot water being called for doesn`t seem to do anything.

Am i right in thinking that i have basically blown the programmer internals up and it is in a permanent CH ON state and hence the thermostat is controlling the boiler directly?

I have managed to obtain a new tempus 7 for a few quid to replace what damage I think I may have done.

Thanks for any replies.

Rich

 

[seco services]

Sounds like you have F*cked it up and blown it.
Why was you doing it with the power still on ?

 

[richf3jones]

I didn`t, I had the power off but the earth wire wasn`t safely tucked away when I put the power back on unfortunately I found it touching the C terminal of the thermostat.

 

[seco services]

What c terminal ?
The tempus 7 is a programmer not a thermostat.

 

[richf3jones]

The C terminal in the digital thermostat I was replacing. A honeywellhomexpert thr 840UK.

All I did was put the RED & BLACK wires in the Live/Neutral switch terminals of the thermostat and tucked the earth out of the way (onto the c terminal ny mistake).

 

[seco services]

Ok get you now it's fed back blown the programmer.

 

[richf3jones]

It sounds (when its working) like there is a relay in each channel because it clicks when you advance to on or auto etc. The HW is still clicking but since the short the CH isn`t clicking anymore. Do you rekon that`s whats done it?

Cheers

 

[seco services]

More likely quite common that it takes the pcb out in the programmer.

 

[richf3jones]

Thanks for your help.

Do you have a recommendation for a replacement model programmer if the Drayton I have bought turns out to be duff?