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Lennox SLP98V Furnace stopped working with Error code 276

We have a Lennox SLP98V high efficiency furnace that got installed about 3 years ago. This weekend it stopped working – no heat – and the thermostat reported alarm number 276 (Watchguard – Calibration Failure) The error code indicates that the low pressure switch is not properly closing. This switch makes sure that the combustion …

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