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You can't repair this control. When the contactor starts to fail you have to replace the control. You might want to consider a Beckett Aquasmart control instead of the L8148. The Aquasmart runs a proprietary algorithm that will reduce your fuel usage by 10% to 20%. It does this by modulating boiler water temp so when it's not as cold out the boiler water isn't as hot. It also does not require an outside sensor and is about the same price as an L8148.
Wiring is very similar to the L8148
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