We have a combi boiler which is no longer providing constant hot water from the upstairs bath tap.
A bit of background: it's a Baxi Duo-tec 33 HE A, installed about 6 1/2 years ago. It's been moved since installation, due to some building work about 2 years ago.
The boiler is on the ground floor, and heats 10 radiators (one on a lower ground floor, 5 on the ground floor and 4 on the first floor). It also supplies the shower in the bathroom upstairs.
About 3 months ago, we replaced the lounge radiator, and had the boiler serviced at the same time.
About 2 months ago, we noticed the boiler getting noisier (fan cycling on and off), when a hot top was run - this seemed to be only when the heating was on at the same time. Then one day the boiler required re-pressurizing and we managed to over pressurise it (about 3.5 bar when cold).
We got a plumber out who adjusted the pressure and also discovered a leaking hot water flow temperature sensor, which he subsequently replaced (plus the pressure valves were all furred up with limescale).
Shortly after this, the boiler failed, due to a blown fuse. The plumber changed the fuse, turned the boiler on and it immediately blew again (due to damp from the aforementioned leak?).After another fuse change, it was fine. It was suggested at the time that the motherboard might be failing? Personally I would assume a motherboard either fails or it doesn't, but there you go.
The boiler is supplying heat to all radiators with no problem. It supplies heat to the shower morning and night with no problem. But. The mixer tap for the bath, now just provides warm/cold/warm water when the hot tap is fully open. It was fine up until about 1 month ago. The only way to get hot water flowing now is from an unacceptably low dribble. The shower is in the same room but is fine.
Any thoughts?
A bit of background: it's a Baxi Duo-tec 33 HE A, installed about 6 1/2 years ago. It's been moved since installation, due to some building work about 2 years ago.
The boiler is on the ground floor, and heats 10 radiators (one on a lower ground floor, 5 on the ground floor and 4 on the first floor). It also supplies the shower in the bathroom upstairs.
About 3 months ago, we replaced the lounge radiator, and had the boiler serviced at the same time.
About 2 months ago, we noticed the boiler getting noisier (fan cycling on and off), when a hot top was run - this seemed to be only when the heating was on at the same time. Then one day the boiler required re-pressurizing and we managed to over pressurise it (about 3.5 bar when cold).
We got a plumber out who adjusted the pressure and also discovered a leaking hot water flow temperature sensor, which he subsequently replaced (plus the pressure valves were all furred up with limescale).
Shortly after this, the boiler failed, due to a blown fuse. The plumber changed the fuse, turned the boiler on and it immediately blew again (due to damp from the aforementioned leak?).After another fuse change, it was fine. It was suggested at the time that the motherboard might be failing? Personally I would assume a motherboard either fails or it doesn't, but there you go.
The boiler is supplying heat to all radiators with no problem. It supplies heat to the shower morning and night with no problem. But. The mixer tap for the bath, now just provides warm/cold/warm water when the hot tap is fully open. It was fine up until about 1 month ago. The only way to get hot water flowing now is from an unacceptably low dribble. The shower is in the same room but is fine.
Any thoughts?
