We've got no hot water.
Called local recommended firm out on Tues. Guy who came then said it's either pump or valve, I don't know. Colleague will look on Thurs.
So today colleague turns up (2 hours late but...). Says yes it's the valve. But I don't have the part. Someone else will bring that. He leaves.
2 more hours other bloke turns up. Valve replaced. No hot water still. Spends ages on phone to someone telling them he can't fix it and it's because valves are turned off to radiators (this is because we had a leak in the summer from the rad, but the hot water issue only started days ago). I can hear him discussing for ages how the water won't circulate and that's why there's no hot water etc.
Anyway after another phone call and some banging about he tells me it's the heat exchanger that is blocked. So it needs to be flushed but they can't do that as my radiator is leaking...so they prob can't restore the hot water but the boss is going to call me tomorrow.
I've looked up issues with heat exchangers and I can't find mention of lukewarm water. Concerned I'm going to end up paying a lot of labour and it still won't be fixed...any advice?