Hi. My first post. had vaillant 828 for 5 years now. A heating engineer said it was the dogs whatsits, so I got 1. British gas fitted it 
Problems from day 1.
DHW heat was colder in winter due to colder water coming in. Flow was poor. they said screw in valve to reduce incoming flow So I have for the last 5 years. Took rad of after year2 to decorate. Rad was full of muck. They said they did a power flush. Year 4 Crap in rads again. Did a proper power fluff (all day) first time took a few hours.
Anyway apart from that, not 2 bad. After 5 years, my cover came to an end. Problems start. DHW starts to get colder, so I screw valve in to make water hotter...no effect. Then boiler starts to heat rads up when remote stat asn't instructed it to do so. So I change batteries on stat transmitter. Still comes on by itself. I check Stat receiver and it hasn't instructed boiler to go on. ( green light, also no rad picture at boiler display, just a flashing "C").
Then I come home one day and boiler is shut down. Water every where. The Rubber hose split. So I change it. It was full of like carbon/Cole like deposits. After fitting a new pipe, the DHW temp stays at a HOT 81, before it was up and down. I guess the Heat exchange is full of crap. I then drain the trap below HE. This war full of bits. Should this be clean?. After bust pipe I had to dry out all electrics. Stat receiver was wet, control panel was wet. Anyway its works fine now, but still the boiler comes on on its own. When I press "I" it says S.24. No Rad picture or tap picture. Sometimes its for about 5 seconds, but sometimes it stays on. Outside temp is warm, so cold stat shouldn't be it.
ANYONE!
Problems from day 1.DHW heat was colder in winter due to colder water coming in. Flow was poor. they said screw in valve to reduce incoming flow
So I have for the last 5 years. Took rad of after year2 to decorate. Rad was full of muck. They said they did a power flush. Year 4 Crap in rads again. Did a proper power fluff (all day) first time took a few hours.Anyway apart from that, not 2 bad. After 5 years, my cover came to an end. Problems start. DHW starts to get colder, so I screw valve in to make water hotter...no effect. Then boiler starts to heat rads up when remote stat asn't instructed it to do so. So I change batteries on stat transmitter. Still comes on by itself. I check Stat receiver and it hasn't instructed boiler to go on. ( green light, also no rad picture at boiler display, just a flashing "C").
Then I come home one day and boiler is shut down. Water every where. The Rubber hose split. So I change it. It was full of like carbon/Cole like deposits. After fitting a new pipe, the DHW temp stays at a HOT 81, before it was up and down. I guess the Heat exchange is full of crap. I then drain the trap below HE. This war full of bits. Should this be clean?. After bust pipe I had to dry out all electrics. Stat receiver was wet, control panel was wet. Anyway its works fine now, but still the boiler comes on on its own. When I press "I" it says S.24. No Rad picture or tap picture. Sometimes its for about 5 seconds, but sometimes it stays on. Outside temp is warm, so cold stat shouldn't be it.
ANYONE!
