CH controlled by thermostat even when programmer off

[Stevex]

I've just noticed that with the CH programmer either selected off or timed off, the CH can still be controlled on/off at the room thermostat.
HW is controlled by the same programmer and is operating normally.
System is a pumped Y plan.
I take it the programmer is fubar?
Anything I can do to confirm or is it obvious the programmer is at fault; it's a Drayton Tempus 7.

 

[Stevex]

The pic is of my programmer backplate.
1=HW off; 3=HW on; 4=CH on
With the programmer fitted and CH selected off I'm getting 240v at wire 4 in the junction box; I take it this indicates a fault in the programmer, with no wire to CH off at the backplate is the CH controlled by voltage at 4 @240v for CH on and 0v CH off?

 

[Deleted member 120897]

It does seem like the programmer and it doesn’t need a CH off, just HW off, which you have. Shouldn’t be getting 240vac at number 4 in junction box if that’s for the room stat.

 

[Stevex]

Thx Chris, I'll get one on order then.

 

[Timmy D]

Have you checked to make sure you’re not getting 240v at terminal 4 of the mounting plate with the programmer removed.

Just to make sure something else isn’t potentially wired wrong.

Also the mounting plate Earth isn’t connected.

 

[Stevex]

Have you checked to make sure you’re not getting 240v at terminal 4 of the mounting plate with the programmer removed.

Just to make sure something else isn’t potentially wired wrong.

Also the mounting plate Earth isn’t connected.

Thx Tim, good call; I checked it and there's no voltage at the back plate on t4, which confirms the programmer at fault.
I noticed the earth not connected, I'll sort that when I fit the new programmers back plate.

 

[Stevex]

Fitted a Drayton LP822, it even used the same back plate as the old Tempus 7; all working normally.