RUUD furnace Mod ugfd-06emcks,KeepRite 1.5 T a/c blower motor on low,temp in house to rise more than before.ramps to high if set the thermostat to a higher temp to shut ac off motor ramps up then off

SOURCE: Amana 1 ton Residential AC / Outside unit comes on for a sec

open the service panel to check for control voltage of 24volts when tstat calling, The contactor should be pulled in, if contactor is down,and contacts appear to be clean, and the unit is still not running, it is a bad compressor. to test this unplug the black wire from the compressoror at contactor,w/ power off! Turn on power if fan works normally it's a bad compressor. However if you see a swollen split cap(5 wires to a soup can looking w/ the terminal C,F,and Comp), switch it first and start at square one.
You also need to consider the high pressure switch if its cycling on off on off.

SOURCE: Carrier 58 Series Furnace Blower Motor Won't Shut Off

Yes. If the high limit is tripped, the furnace will bring on the fan continuously until the limit resets. Often, they will not reset if tripped repeatedly. If the furnace is too large for your application, you probably are not able to move enough air to keep the heat exchanger cool enough.

SOURCE: Bryant Plus 90 Furnace - Blower works fine and

PRSSURE, DRAFT SAFGUARD, AUX-LIMIT SWITCH(WHEN USED)OR BLOCKED VENT
SWITCH(WHEN USED) DID NOT CLOSE OR REOPENED (DOWNFLOWONLY)
If open longer than five minutes, inducer shuts off for 15 minutes
before retry.
Check for:
* proper vent sizing
* defective inducer motor
* restricted vent
* excessive wind
* low inducer voltage(115VAC)
* defective blower motor or capacitor
* defective pressure switch
* inadequate combusstion air supply
* disconnected or obstructed pressure tubing
If it opens after trial for ignition period, blower will come on for
90 sec. recycle delay.
Check your air filter for blockage, check pressure switch for a buildup of moisture. Make sure your inducer motor is turning and creating a vacuum to the pressure switch. Make sure all venting is clear and free of water or debris. Make sure there is no water in inducer motor and all drains are draining.

SOURCE: My furnace comes on and heates the house for about

Make sure filters are clean . if they are stopped up the unit will over heat. Lets start there. Russ

Testimonial: "James, YOU DA MAN!! I would have never guessed the filters could cause these symptoms. Recent carpet cleaning may have added to filter clogs."

SOURCE: heil furnace blower motor stays on won't shut off at thermostat blows cold air continuously

Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call