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My furnace flashes green lights, the book states that limiter is stuck open or closed. what part do need to fix this problem

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The limiter is the safty switch that does not allow your furnace to over heat it should be located near the heat exchanger

Posted on Sep 08, 2010

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B&d control a door mpc2 model not opening control panel has flashing green up down light and also flashing red light limit set


Check your user guide if available. It sounds like you haven't set the door open limit, so press the up arrow & fully open to the door & push set, do the same for the down arrow until door is completely closed. Push the set button again & the door should be right..

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Furnace problems


On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

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1 Answer

Ever limit switch i changed in my Weatherking furnace, it breaks the switch, what could cause this?


You need the model number of the furnace to determine what the flashing light is telling you. Many times the part that looks to be at fault is not the true fault in the furnace. A slow running blower could cause the limit switch to trip. The circuit board tells you that the limit tripped, but the real cause is the motor or clogged filter.

Jan 02, 2016 | FACTORY AC PARTS Limit Switch Double Pole...

1 Answer

My Xenon high efficiency furnace has a red blinking led light that blinks 4 times and my furnace will not light. What could be the problem?


Gas furnace fault or error codes for common furnaces - Gray ...

www.grayfurnaceman.com/-ifc-failure-codes.html
Each color will also flash a specific number of times to signify a specific error. ... 4 redcolored flashes may be signaling that the "high-limit" switch might be open. ... 3 green colored flashes on your furnace has the same meaning as 2 green colored flashes. ....If a system problem occurs, a blinking LED shows a fault code.Missing: xenon

7 Tips and Tricks to repair your Furnace DIY - YouTube

? 13:25
https://www.youtube.com/watch?v=rAtcvPqUsBA
Dec 18, 2012 - Uploaded by JRESHOW .
Flash sequence codes 1 through 11 are as follows: LED will turn "on" ... 4 RED FLASHES: This indicates that the main limit switchhas opened ... This no-light condition occurred 3 times (2 retries) during .... My furnace trane xe80 is only flashing once my manual says something about flame being locked out ...Missing: xenon ‎efficiency

Nov 21, 2015 | Heating & Cooling

1 Answer

Do not get 24 volts from 120/24 volt transformer how test it?


Yes. There could be a couple of high limit safety devises in the circuit that can open the circuit to the gas valve. Pending your furnace type If your thermostat is calling for heat and the furnace tries to start your transformer is working. High limit safety controls are normally closed. If you have a open limit switch you will not have any continuity through it using an ohm meter or if you test it with a volt meter you will have 24 volts across the terminals of the safety devise. Other problems can be pressure switches, hot surface igniters and control boards. most newer furnaces have a control board that will flash a light code to help trouble shoot the system. Count the flash pattern and look on one of the furnace doors for the flash code directory.

Jan 01, 2015 | Heating & Cooling

1 Answer

York "high Aux or spill limit switch open"


how can I fix the spill limit switch, also how do I found it

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Meaning of rudd furnace trouble codes


Error Codes
A green LED indicates system faults
Steady On: System OK
Steady OFF: Board control fault or no power applied
1 Flash: Ignition failure (control in one-hour lockout)
2 Flashes: Pressure switch fault, fails open (switch is
stuck open)
3 Flashes: Limit switch open (main or auxiliary)
4 Flashes: Pressure switch fault, fails closed (switch is
stuck closed)
A yellow LED indicates flame status
Steady on: Normal flame is sensed
Flashes: As flame weakens, frequency of LED flashes
increases

Dec 12, 2009 | Heating & Cooling

5 Answers

High limit switch open on armstrong furnace


If you know where the high limit switch is you can always cut the two wires and wire them together causing the limit to close. But what you have to watch out for is why the high limit is not closing. That means in your return air either you have a dirty return air duct, dirty filter, or you don't have all your registors open to allow the heat to escape the heat exchanger. Just watch over riding the system. The high limit switch should either be on or behind the blower, in the middle of the system right under the heat exchanger. any other questions about hvac just ask.

David

Mar 23, 2008 | Heating & Cooling

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