HELP WITH BAXI 38/3RS

[shieldsy0]

Boiler kettled last week and shut down. Checked water flow and found that the pump was jammed. Replace the pump next day.
The burner now fires up and runs for a couple of minutes(pilot light remains lit) Then it just shuts down and won't restart for about half an hour. Bled all the water system and the pipes are heating up nicely when it does run.
I have tried pulling the thermostat probe out to see if it made any difference. It never really helped at all.
Is it possible that due to the previous weeks overheating, the thermostat has been knocked way out of range and thinks that it is constantly overheating????
Or is there another reasonable explanation.
p.s This also happens when only on hot water circuit.

Help required please!!!!!

 

[gas4you]

If the ch is working ok then it sounds like an air lock in the dhw indirect circuit.

Have you an air vent next to the hot water cylinder off the pipe going into the middle of the cylinder?

 

[shieldsy0]

Just tried a new stat and guess what????
Still the same.
This problem occurs whether I am on CH or HW circuit.
I have even removed the stat probe from the front of the boiler and it still cuts out.
I dont understand why even with an airlock that it shuts down as there is no way that the system can know that there is water flow or not. It can only determine the temp due to the stat probe.
Is there something that I am seriously missing here???
I have ran out of ideas.

AAAAAAGGGGHHHH
I hate gettin beat