Combi boiler Problem

[jc67]

Hi
I have a Warmflow Combi boiler 70/90 and a couple of days ago we turned the heating on and only the upstairs came on.
I increased the pressure in the system as it was a tad low and also turned the heating up full incase there was an air lock of some sort (can there be in a pressurised system?) to try and blow it out.
Both were to no avail.
I then thought it was the downstairs thermostat - we have two, one upstairs and one downstairs.
I bought two new thermostats and proceeded to fit them, however I managed to blow them both by not turning the power of first - my bad.
I've now fitted the new thermostats and now the boiler does nothing when the heating is turned on.

Q. Could I have blown something else possibly in the boiler that I need to reset/replace?

Points to note,
The Domestic hot water side of things works fine.
The thermostat is sending a signal for the boiler to come on (battery operated).
The thermostat is wired
Brown - 3 or C
Grey - 2 or ON
Black - 1 or OFF is this correct

Below is the thermostat and wiring details (not the best)

http://www.sunvic.co.uk/tlx7501rt.html

This is my boiler

http://www.tradeplumbing.co.uk/asse...y-Condensing-Boilers-Manual-3307-Issue-01.pdf

I believe its the 1.5.5 U-Series Utility – Combi (UCHE) on page 12

Also any ideas what the initial problem could have been?
Incase I get back there without the help of an engineer.

Thanks in advance
Jonathan

 

[Agile]

You must have two zones and probably the DS motor valve has failed. It could probably be moved to a manual setting for the moment.

I cannot guess whats you have done now. Maybe connected it wrongly or blown something!

Tony

 

[jc67]

Got it sorted, after I replaced the thermostats and control panel I checked the downstairs DS motor valve and it was frazzled.

As Agile said it could be set to manual until I bought a new one and got in swopped out.