Central Heating Timer gone mad (2 of them)

[gatita]

I am at my wits end..... and so is the central heating engineer that fitted the system.
I had a new central heating combi fitted a year ago. This is in the garage. The timer was put indoors. Well, the timer has NEVER worked properly from day one. Sometimes it will switch itself on correctly, other times nothing. I can even have the timer switched to OFF!!!! and it will switch itself on.
Can anyone PLEASE suggest what the problem might be. Forgot to mention, last week another NEW timer was fitted, the same things happens.

 

[petit_pablo]

Details, details, details!

Makes, models, locations, settings etc

 

[gatita]

Oops! sorry, the Combi is an IDEAL 30 Logic Plus , one year old. The Timer is an Ideal PRT 2

As I mentioned before the Combi is located in the garage, and the timer on an inside wall approximately 30 ft between them (2 walls).

Tonight for example using the timer function with the thermostat at 24 degrees approx. it did not switch off at the set time and was still running half an hour later. We put the timer to 5 degrees that did NOT switch it off, we then switched the timer to OFF, and that didn't work either. We then took the timer off the wall and took it to the garage and only when I took the battery out and put it back in again did it switch off the heating.
We have tried 3 timers, so surely it can't be that, we have also tried moving the timer a bit nearer to the garage.
Could it be that the board on the Combi is faulty? its all I can think of!
HELP

 

[picasso]

Is this your timer ?

http://idealheating.com/downloads/manuals/204797.pdf

 

[kidgreen61]

Is there a frost stat in the garage that has not been set correctly, or is faulty?

 

[picasso]

it looks like on the mechnical rf stat you leave the boiler link wire in place and on the digital rf you remove it, lets see what timer the op has.

 

[gatita]

Thank you for your replies this is the link to the timer we changed a few days ago:

http://idealheating.com/downloads/manuals/RF_Mechanical_Programmable_Room_Thermostat_24_hour.pdf

Thanks again

 

[gatita]

P L E A S E can anyone suggest something?

PS. the RF is a mechanical one