It is also possible for the switch to get jammed because the switch itself is faulty.
Water heater pressure switch problem.
The switch is connected to hoses and the water in these can sometimes cause a little bit of a problem.
Step 2 inspect the pressure.
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Pressure switch remained closed longer than 5 seconds after heat was requested.
Disconnected torn or blocked pressure sensing tubing from air pressure switch to blower housing.
Reconnect or replace pressure sensing tubing.
This video provides step by step repair instructions for replacing the pressure switch on an ao smith gas water heater.
Water leaving the hot water heater should flow at the same pressure as the cold water in your home.
Check to see if the pressure switch wiring is correct and secure.
High limit switch open due to excessive vent temperature or defective switch.
Part of the series.
If it does not a problem exists at the water heater tank itself or in the lines that distribute.
Lo water pressure switch vent pressure switch or temperature limit switch fault.
Replace defective pressure switch.
How to fix no water pressure from a hot water heater.
This could be as simple as your filter was dirty which constricted flow to the heater or you would have to troubleshoot the various switches.
Fixing no water pressure from a hot water heater will require you to first check your shut off valve.
If the wiring is correct than you should replace the pressure switch.
Pressure switch remained open longer than 5 seconds after the combustion blower started up.
Check the switch for any kind of a mechanical jam.
Air pressure switch not closing due to defective switch.