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Central Heating & Storage Heaters Forum
Drayton LP241 Problem - Pump and Boiler Constant Running
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<blockquote data-quote="ProDave" data-source="post: 497811" data-attributes="member: 6969"><p>It will be the microswitches that has failed and stuck on. Orange and Grey connect just to the microswitch and I bet that is stuck. It could be either the heating or the HW valve head that has the stuck switch. Disconnect the orange and grey from one valve at a time to work out which head has the stuck switch. If you are adventerous you can usually replace just the microswitch inside, if not replace the whole head.</p><p></p><p>For a more reliable outcome, but more work, change the whole valve and body for a Honeywell. More metal less plastic tat.</p><p></p><p>There will usually be an automatic bypass valve somewhere so with both valves shut the water will pump around a short loop of pipe. It will still waste some gas keeping that loop of pipe hot for no reason.</p></blockquote><p></p>
[QUOTE="ProDave, post: 497811, member: 6969"] It will be the microswitches that has failed and stuck on. Orange and Grey connect just to the microswitch and I bet that is stuck. It could be either the heating or the HW valve head that has the stuck switch. Disconnect the orange and grey from one valve at a time to work out which head has the stuck switch. If you are adventerous you can usually replace just the microswitch inside, if not replace the whole head. For a more reliable outcome, but more work, change the whole valve and body for a Honeywell. More metal less plastic tat. There will usually be an automatic bypass valve somewhere so with both valves shut the water will pump around a short loop of pipe. It will still waste some gas keeping that loop of pipe hot for no reason. [/QUOTE]
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Drayton LP241 Problem - Pump and Boiler Constant Running
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