1. Smart meter installation very unlikely to be anything to do with the problem.
2. The pump doesn't "drive" the boiler, the boiler drives the pump.
3. Much more likely to be a controls issue. I would look at (in order):
3a. Motorised valve(s).
3b. Programmer.
3c. Room and / or hot water cylinder thermostat.
3d. Boiler itself.
4. What system do you have:
4a. Boiler make and model?
4b. Central heating set up. Motorised valve with one inlet one outlet? Motorised valve one inlet two outlets? Room thermostat? Radiators / Underfloor? Sealed system (no small tank in loft)? Open vented (small tank in loft)?
4c. Hot water set up. Motorised valve with one inlet one outlet? Motorised valve one inlet two outlets? Cylinder thermostat? Ordinary (vented) hot water cylinder? Unvented cylinder? No cylinder?
4d. What programmer?
I did think it was odd the smart meter would have this effect, but it only seemed to happen after they came.
I have recently moved into this property, so I do not know the ins and outs of the system. I am also a total novice, so I don't know all your answers. I have contacted the person that installed the system but he is not getting back to me, and it's pretty urgent that I get this fixed because of the cost.
The system, as I understand it, is as follows. It is quite unique as it's a single pipe system throughout the house.
Single Pipe Central Heating system, powering radiators throughout the property. About 2/3 of the radiators have Honeywell Thermostatic valves, the others have no TRV installed so are either on or off.
We have a Worcster 8000 50kw boiler.
This feeds the radiators, and also a 250L Joules Unvented Indirect Hot Water Cylinder.
All controlled by a Honeywell EvoHome system.
All fed of the mains, no tank in the loft.
There IS a small white tank next to the water cylinder, that is called a Zilmet Expansion Vessel, but again, im not sure what that does.
"Motorised valve with one inlet one outlet? Motorised valve one inlet two outlets?" - I'm sorry, I don't know how to check this to answer.
I have been trying to troubleshoot. I can turn everything off via the EvoHome controller, and the boiler remains ignited. The hot water doesn't seem to be the culprit as I can turned this off, confirmed the hot water ran out, and then turned it back on to get hot water back.
The radiators without TRV's are warm right now, but they should be cold as I've turned the CH off entirely. If I turn one of the radiators with a TRV on, said radiator will heat up and the not TRV radiators will get hot, as expected in a single pipe system.