Somewhat of a giveaway for the source of the problem were the gurgling noises that the furnace was producing while the combustion air inducer was running. This switch makes sure that the combustion air inducer is working properly and drawing exhaust gases out of the combustion chamber. The error code indicates that the low pressure switch is not properly closing. This weekend it stopped working – no heat – and the thermostat reported alarm number 276 (Watchguard – Calibration Failure) ![]() ![]() ![]() We have a Lennox SLP98V high efficiency furnace that got installed about 3 years ago.
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