Boiler has started to shut down with the overheat lamp lit. This happens after the boiler has been running for at least 8 hours. Once reset, it will run again for a number of hours before tripping out again. The problem is more likely the central heating system than the boiler. Basically the hot water is not getting out of the boiler fast enough so that when the flame goes off the residual heat in the boilers internal heat exchanger causes the water to become overheated and trip the safety device.
- Has the pump speed been turned down? Turn it up to maximum.
- Do you have radiators and /or towel rail that have manual valves on (not thermostatic) to accept a flow of water when other rooms with thermostatic valves on have warmed up? If so are they open?
- Have you recently insulated some pipework that is meant to be uninsulated as part of a heat sink / by pass system.
- Is there a lot of air in the system preventing proper circulation?
- Is the system working properly otherwise? sludge in the system may prevent proper circulation.
- Is the flue is not blocked?
- Does the pump connected to overrun?
- Is by-pass valve opened?
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