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When you say old style is it a randall 102/103 It has clock face and a switch on the side for Heating - Heating&hot water or timed off constant

If the heating is switched off and no water is running does the boiler fire on it's own?

All with TRV's. Should have one without to act as a by-pass If all rads are at temperature (I.e by the room) and the boiler finishes a HW demand and spins the pump to shift any excess heat there is nowhere for this to circulate

Sounds like all external controls are calling for heat I.e clock/roomstat and the boiler is firing but the diverter motor is not shifting the boiler into heating mode and just circulating round the boiler as if in HW mode but because no tap is running no heat is being removed from the boiler...

You can do it :D

You can get a 2200 long but you'd need to contact a merchants they are not an off the shelf rad due to the length and likely cost more. You could get a shorter rad and make it up with extensions they come in 20,30,40mm or put s section of chrome pipe between the valve and rad. Both look a...

It's either a restriction on the new tap not creating enough pressure to prove the DHW microswitch or the diaphragm in the flow switch is on it's way out.

When you say on/off do you mean boiler starts/stops or do you mean display/power on/off

It's advisable to set your pump speed to match the system. Try it on 1 first if there is no noise from the boiler and your radiators heat up ok then leave it on this if not try 2 before setting it to the maximum. The pumps job is to overcome the resistance that's created by the central...

Does it do this with or without a demand for heat? I.e hot water or heating calling for it to be on

Undersized gas supply can affect the operation of an appliance. A boiler and a range cooker off 15mm. You beans will take ages to warm when the heating's on The installer of the supply (if gas safe registered) should rectify his work for nothing. He should have read the novel on correct...

Good look getting a building cert for a non-condensing boiler. £399 for a boiler with 1 year guarantee. There's probably a reason they only give you a 1 year guarantee and why it's £399 Buy cheap

If it's on the system then you could try leak sealer however depends how fast the pressure is lost as to whether it forms a seal or not

When you say heating running low do you mean room thermostat on low or the thermostat for the radiators on low??? if the boiler is running and it's low you will collect condensate and more of it. You need to charge your boiler up to pressure and isolate it from the mains. Locate the...

Sure did I remember doing them too. Also remember the bog brushes issued by BG soley for cleaning the heat ex's

Does it ever go to a fault code? The neon lights A and B flashing in different sequences represent different faults.

I concur. Our firm contracts to building firms. Running about 8 sites all with 60 plus houses per site (some up to 200 houses) all have Logics. Has about 2 boiler failures. That's a good ratio to me. I have also fitted a few. Some 2 years old now and lokking and running like brand new...