could it just be the by-pass not fuctioning? So it wouldn't be a temperature issue really, but a water flow issue? And of course, no flow = getting high temperature inside the boiler from residual heat. Can you see or hear water going through the bypass when all the valves are closed?
Evohome -Boiler Lockout - Help !!
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Originally posted by f1arp72 View PostI don't think it ever has been . We asked a plumber once and he basically said there's nothing they really service in these models so didn't touch it.
I've recently had a failed DIY attempt to stop it kettling so I may call this new plumber out that we've used once to sort that and ask him to give it a service and see what he says.
First thing to do before considering a controls upgrade is make sure the existing system is operating at maximum efficiency.
And you don't want a 'plumber' to service your boiler, you want a gas safe registered heating engineer.Last edited by top brake; 8 May 2015, 06:50 PM.I work for Resideo, posts are personal and my own views.
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The only time I have seen lock-out on the Suprima 50L that I have, is when something strange happened and the radiator valves were all closed, but the BDR91 was still on. The bypass loop is short, so it won't take long for it to heat faster than the boiler expects resulting in a lockout. However, the boiler always recovers from the lock-out on it's own a few minutes later.
After the BDR91 cuts out, the pump over-run keeps the water circulating through the bypass loop. The lockout doesn't just indicate "over-heat", it also indicates insufficient water flow if memory serves correctly. What I am wondering is happening here, is that the water is unable to flow quick enough when it is forced only through the bypass loop. This would happen if the bypass loop balancing valve was not set correctly.
In my home the bypass balancing valve was not set correctly as it was left "wide open" resulting in me always heating up the bypass loop. Unfortunately the charts have all disappeared online due to age for the valve and pump so I had to guess mine by listening to the flow of water when in bypass loop only mode.
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Thanks everyone. I'll have to get the thing checked over properly. Definitely sounds like a flow issue when it's simply circulating through the bypass valve. The BDR91 and boiler do cut out so the water that circulates shouldn't be getting hotter. Never liked my boiler from the day it ended up on BBC Watchdog !!!!. Maybe it's time for a new one !!Last edited by f1arp72; 12 May 2015, 05:12 PM.
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Originally posted by f1arp72 View PostThanks everyone. I'll have to get the thing checked over properly. Definitely sounds like a flow issue when it's simply circulating through the bypass valve. The BDR91 and boiler do cut out so the water that circulates shouldn't be getting hotter. Never liked my boiler from the day it ended up on BBC Watchdog !!!!. Maybe it's time for a new one !!
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Originally posted by paulockenden View Post@f1arp72, can you hear the water being pumped through the bypass loop? Does the bypass loop pipe get warm? If you have a thermometer of some kind (those spot IR ones are good for stuff like this) can you monitor the temps on the boiler's in and out pipes when this fault occurs?
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