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Payne Trouble Codes 33 and 13

These codes can be set by a problem with the high limit switch, which shuts off the gas when the temperature in the heat exchanger exceeds the upper limit.

Symptoms: the blower fan comes on immediately after powering the furnace back on. The gas does not come on.

If you suspect this as the problem, try setting the fan from auto to on to cool the exchanger. Make sure all the vents are open. Clean or replace all the filters.

You can reset the high limit switch by tapping on the tan plate above the wires. Be careful to not touch to wires.

These are temporary measures that may provide a work-around until you can have the unit professionally inspected.