Cold Showers After Some DIY Central Heating Work!
- Thread starter jagillham
- Start date
Highly unlikely.
Blind leading blind?
Mutterings about too low a flow rate from HW tap but no mention of what it measures or even should be!
The only way to diagnose faults is to make proper scientific measurements1
So whats the flow rate at which the boiler JUST starts to fire up?
Joe may measure that in gallons per minute but we know better!
When I can charge a fixed £84 to diagnose faults, I dont see why anyone is paying £90 per HALF hour.
Mutterings about too low a flow rate from HW tap but no mention of what it measures or even should be!
The only way to diagnose faults is to make proper scientific measurements1
So whats the flow rate at which the boiler JUST starts to fire up?
Joe may measure that in gallons per minute but we know better!
When I can charge a fixed £84 to diagnose faults, I dont see why anyone is paying £90 per HALF hour.
Ha! I was expecting some fancy machine to do this
Hot tap fully on...
1000ml jug filled in 7 seconds... So 8.5l (15 pints) per min by my calculation?
Hot tap just enough to fire...
1000ml jug filled in 19 seconds... So 3l (5 pints) per min.
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The flow rate is immaterial. Rather than spending all your time trying to prove Joe-90 wrong why don't you tell him what the problem is? 
What happened is this:
The system is dirty. When the radiator was changed it allowed sediment to float around into the system. This has been dragged into the plate HE, and partially blocked it.
This then causes overheating and the thermistor switches down the boiler and so it runs cold. When it cools it comes back on for a bit. It is known as 'cycling'.
What is necessary is to remove the plate HE and attempt to clean it with a propriatory cleaner and flush it out.
If that isn't possible then get a new one.
Nothing else really matters.
It's pretty basic stuff.
What happened is this:
The system is dirty. When the radiator was changed it allowed sediment to float around into the system. This has been dragged into the plate HE, and partially blocked it.
This then causes overheating and the thermistor switches down the boiler and so it runs cold. When it cools it comes back on for a bit. It is known as 'cycling'.
What is necessary is to remove the plate HE and attempt to clean it with a propriatory cleaner and flush it out.
If that isn't possible then get a new one.
Nothing else really matters.
It's pretty basic stuff.
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