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I have aproblem with an airhandler where blower wouldnt shut off completely,replaced the blower control board but problem remains,not on low voltage side,disconnected tstat wiring and stil stayed on
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Blower Motor Always On
Disconnect the blower motor relay.
Does the blower motor stop running?
YES or NO
2
Disconnect the blower motor relay.
Does the blower motor stop running?
--
YES - Go to Step 4
NO - Go to Step 3
3
Repair the short to the voltage in CKT 65 (PPL) wire.
Is the repair complete?
--
Go to HVAC Blower Controls System Check
--
4
Turn the blower switch to the LOW position.
Connect a test lamp between CKT 52 (ORN) wire and ground.
Does the test lamp light?
--
YES - Go to Step 5
NO - Go to Step 8
5
Inspect for a short to voltage in CKT 52 (ORN) wire.
Is the circuit OK?
--
YES - Go to Step 7
NO - Go to Step 6
6
Repair the short to voltage in CKT 52 (ORN) wire.
Is the repair complete?
--
Go to HVAC Blower Controls System Check
--
7
Replace the heater and A/C controller. Refer to Control Assembly Replacement .
Is the replacement complete?
--
Go to HVAC Blower Controls System Check
--
8
Replace the blower motor relay.
Is the replacement complete?
--
Go to HVAC Blower Controls System Check
--
First check for 240 volts on black and white at the motor. Yes it must be on and calling. Yes its dangerous and you should call a professional. If 240 present then check on the speed harness for 24 volts between any of the terminals. If both voltages present, bad motor. Very common for these motors to fail, if blade spins freely and module is separate you can likely just replace module.
Hello, First thing is verify if you are getting voltage to the motor at the low speed motor terminal tat he control board and neutral. if you have voltage, next step is to check the capacitor, Discharge it and use a meter to verify the microfarad rating, if it is too low replace the capacitor. If that checks out good then the motors windings are either open or shorted to ground and must be replaced. If you don't have voltage at the control board then the board must be replaced.
Hello CHARLIE Yes that was a 24 volt wire that got shorted 1:The wire must be repaired/replaced.2:The fuse is in the blower/airhandler unit it should be a 3 or 5 amp blade fuse (the one that is in a car) on the curcit board, or a button that poppes up on transformer in the blower unit just push that in to restore low voltage power.
either bad blower motor, or capacitor for blower motor is bad or thermostat not telling blower to come on try to take the wires off t-stat be carefull which one you touch it is low voltage but you dont want to blow a transformer. use as wire and touch the g and r terminals and see if it comes on if it does it is your t-stat if not issue is at furnace or airhandler
blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
24v----------------
24v----------x----------
24v--------{3ampfuse}----------
now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you
Sounds like fan motor is bad getting hot and opening the circuit inside the motor and then after couple minutes cools off enough to complete the circuit and runs for little while and does it over and over.
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