There are a few reasons why the limit would be opening and the first is a dirty filter.
Goodman furnace open high limit switch.
Some furnaces will have two or even three high limit switches wired in series and checking the temperature at deferent points in the furnace.
The main limit is made of black plastic it is rectangular about 2 high by 4 wide has two electrical male spades on top and is mounted by two sheet metal screws there is an insulated probe.
I put one probe from my meter to the brown wire coming from the limit switch to the board.
Primary limit open 215 f 10728338 primary limit open 215 f sku.
Attempting to reset the furnace limit switch while the power is connected may result in electrical shock.
Goodman residential furnaces contain multiple limit switches to ensure safe operation.
This all makes perfect sense that the high limit would open because at no time does the furnace blower attempt to run.
When i put the other probe on the white or blue wires at the board that came from the gas valve i get nothing indicating on open circuit.
Now the blower does function fine when thermostat is set to cool or off with fan set to on.
A separate brown wire goes from the other side of the limit switch to the board.
The primary limit switch which prevents the furnace from heating to unsafe temperatures is programmed to reset automatically after a malfunction.
The furnace should fire unless the switch is stuck open.
Example limit switch on amazon honeywell l4064b2236 combination fan and limit furnace control.
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Things to check first.
B13701 45 goodman oem furnace replacement limit switch l300.
Am i testing correctly.
To be safe i replaced the filter.
Founded in 1982 goodman manufacturing is an american company that produces heating and air conditioning equipment for residential and commercial customers.
Throwing a trouble blink code 4 flashes which indicates high limit open.
High limit tco switch b1370108 high limit tco switch.
Also your blower is on a timer so after the.
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If the furnace failure code indicates an open limit or open high temperature switch or open rollout switch it is probable that the furnace has overheated.
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