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http://www.plumbnation.co.uk/site/grundfos-upp15-50-pumpplan-twin-headed-domestic-circulator-pump/ One of these might help.

If the pipe connecting the exp vessel to the water section of the boiler is choked then this would give you the same problem as no air/too much air in the vessel.

The first thing to check would be that the boiler is getting a live feed from the external controls. If the boiler fires initially then shuts down it will be the wax capsule in the diverter valve.

Most manufactures instuctions will recommend an external by-pass if you are fitting TRV's to the radiators.If you were fitting a 3 port then it wouldn't be an issue but as you stated you will be fitting 2 ports then the choice is yours.A towel warmer without a TRV,but with 2 lockshields would...

Even thou the boiler has an internal by pass,its good practise to fit one externally,especially if the rads have TRV's fitted.

If it was a problem with flame detection then the ignition sequence would go no further than the pilot flame stage.As you state that the system heats then i don't think this is the problem.If the main burner is ignighting then cutting off then it could be a problem with the pcb.One thing for...

If there room,fit the zone valves by the boiler.Less work and easier for maintenance purposes.

The pump will be either wired through the boiler or the motorised valve.It could be something as simple as loose wire in the joint box from when the new valve was fitted.If you can test the pump for power then it might save you from replacing it needlessly.

I think you could be right .Do you have a set of test lamps or a multi meter to test the pump has power going to it?

It's more likely to be the horse shoe switch that clips on to the divertor valve.When you remove the switch from the divertor the boiler should fire up.Open and close the switch with your finger to ensure that the boiler fire every time the switch is released.If it dosent then its the switch if...

Is the boiler a Baxi Bermuda?If it is then the service engineer has left the thermostat phial dangling over the flame when he has put the combustion cover back on.

It would appear there is a restriction between the plate and main heat exchangers.Maybe the divertor is stuck or the plate heat exchanger is blocked.

If the fan is cycling on and off without the boiler firing up then it is possible that there is a faulty relay switch on the pcb.

The orange flashing light on some older Alpha's would suggest a fault on the primary ntc sensor. If you have the installation manual you will find in it somewhere a list of fault light indicators with the relative faults for each one.