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High pressure switch furnace.
First turn the power of the furnace off.
Explanation of a how air pressure switches operate in gas furnaces and water heaters.
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Now use the ohmmeter to check whether the pressure switch is functioning properly.
Check the tubing from the inducer.
The pressure switch is the small cylindrical object near the lower right in the photo.
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It should be clear.
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The inducer is the large object in the center of the photo.
There are two electrical connections to this pressure switch.
A furnace pressure switch is an automatic safety feature located near the motor.
Turn off the power.
The pressure switch is an indicator of pressure problems in the furnace.
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Other problems that could cause the pressure switch to not open are a dirty blower wheel on the inducer.
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Next take off one of the power hoses and blow on it.
Turn off the power to the furnace by switching off the disconnect switch located near the furnace.
It shuts the furnace down if it senses negative pressure created by the draft inducer motor.
This protects your home from dangerous backdrafting which is when exhaust fumes are reintroduced into the system.
Also the fittings that the tubing fit into should be clear.
Check for obstructions in the hose.
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Newer high efficiency furnaces have pressure switches like the one shown in the photo below.
If there is no disconnect.