Is the boiler firing or not with that temp of 89.5C?
Those temps were taken whilst the heating was running can't remember exactly if the boiler was firing at that exact moment but the temp would be fairly consistent in any case.
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Is the boiler firing or not with that temp of 89.5C?
I think the max boiler setpoint temp on that boiler is 75C or maybe just 80C max?. Can you ensure that the pump is pumping away from the boiler and what is the power showing there, it looks like 13W? What is the boiler stat set to? there is a 28mm? copper elbow under the boiler stat, is that the vent?.
Thanks, that very high temp of 89C might cause the pump to cavitate and cause circulation problems, might try a SP of ~ 70C for tomorrow and see what the pump power is. Can you see what that power reading was above, looks like 13W to me.
OK thanks again, can see tomorrow what the 70C does, if anything, you will soon know as the boiler dT will decrease if the pump is circulating more.
Presume boiler only ran continuously for 20 minutes or so and then started cycling??.
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