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If the boiler is still under warranty you should not involve a third party. Get the installer back, he will handle the warranty claim for you. You should not be charged - unless the fault is not boiler related.

Pump overrun is controlled by a timer on the boiler PCB, which is why the pump is wired to specific terminals on the PCB (terminal block ST2). As the pump works OK when the boiler is on, there's a good chance that the timer is fault. Unfortunately this means a new PCB. WB do a fixd price repair.

It wouldn't work! The air vent connection must be at the top so any air, being lighter than water, can rise up unimpeded.

Could that be because, as in the current example, it has not been fitted in accordance with the manufacturer's instructions?

If you read the OP's first post carefully you will see that the valve is working exactly as expected. The only problem is that, when in mid-position, there is insufficient flow through the cylinder.

The end lever is not a reliable indication of how far the valve is open. This is because it is not attached to the spindle. This is demonstrated by the lever being 'loose' in the slot when the valve is open to heating.; The lever is only there so the valve can be be opened manually, e.g when...

See X400 to flush or not

Please keep us up-to-date with what the result is.

The Aerjec has a reputation for getting blocked up. Use a magnet to check the pipes connected to the Aerjec for blockage.

I thought you were going to try rebalancing with the pump on 2. What happened? Are you bleeding the rads with the boiler/pump tured off and the water cold? You also need to bleed the ground floor before the first floor.

According to Sentinels own website, the chemical only holds the sludge in suspension for 3-4 weeks; but there's nothing to stop you leaving it in for as long as you like. (Not that it would do any good!)

Do you have a hot water cylinder? If so, is there an electric immersion heater in the cylinder. If there is, has it been turned on by mistake? If no immersion heater, is there a thermostat attached to the side of the cylinder? What temperature is it set to?

The right hand pipe should connect to the boiler flow (left connection on boiler).The pipe from the pump should connect to the motorized valves. Don't worry about how many watts the pump is using. It will vary with the flow rate and required head. Assuming you need all 24kW, the flow is...

That's not a rule; it depends on which way the water has to flow. Pumping upwards is preferable. Provided you have sufficient static head (drop from F&E tank to pump), pumping down is OK. Now we have established that you have the Ri version, which pipe from the boiler connects to the pump - the...

Just read that you have a system boiler. So you shouldn't need a second pump. Who said you did? If the arrow is pointing towards the boiler it is either on the return (right-hand pipe at boiler) or it's pointing the wrong way! Was the Alpha 2 installed at the same tiime as the boiler? Which...

The i version is a system boiler, which has the pump built-in. Do you mean the Ri version, which uses a separate pump? How many radiators do you now have? I doubt very much if your "engineer" will be able to provide you with meaningful answers to Grundfos's questions.

Some information about your equipment would be helpful, e.g make and model of wireless thermostat

BG Engineer came yesterday afternoon. At first he thought it was the wireless prog stat (DT10RF) losing contact with receiver in the boiler. This was because he put it in "chimney mode" and it ran all the time without stopping. I suggested bringing the wall unit closer to the boiler, which he...

I had decided that you were correct and was going to phone an engineer this morning when I happened to wake up at 5am. I decided this was an ideal time to check the boiler (in airing cupboard opposite bedroom door) as it would have only come on recently. The boiler was on, temperature showing...

You are assuming that the boiler only goes off when the flow temperature exceeds that set on the boiler's thermostat (apart from room stat control). But this doesn't appear to be the case. There is no return temperature sensor, so monitoring the differential is not possible. As another...