Is this a heat pump or a gas heater? If it's a gas heater and the blower comes on immediately, you have what's called a critical failure. A high limit has tripped. You need to check the roll out switch and the high limit temperature sensor mounted in the combustion chamber. If you have a stack limit switch, you need to check that too
On what, exactly.?
SOURCE: BLOWER FAN WONT SHUT OFF WHEN THERMOSTATE IS OFF
The compressor coming on when the contact is pushed is o.k. they all do that. As for the blower fan not shutting off, some brands (Payne for example) the heating fan relay is a n.c. (normally closed ) relay. so if the time delay relay or thermal link are bad or not connected, the fan will blow even when it is turned off.
SOURCE: The Heat/Vent fan is not turning on
I had the same problem. Try replacing the blower resistor behind the glove compartment. ($59.00 for part at dealership & 20 minute easy job. Two screws at bottom of glove box and two screws on resistor and replace. The blower ($150.00) motor may be causing the resistors to blow. I have already blown two speeds on my new resistor and believe it is because the bottom bearing on the blower motor is a little tight causing it to stick or slow start at lower speeds. No problem yet on high. Probably needs replacing.
SOURCE: coleman mobile home electric furnace
Peace,
It seems you need hands on servicethis time !
ngafm
Bless You,
Please leave me a rating before you sign off!
Thank You
SOURCE: heater control wont heat. AC and fan works fine
The heater core was plugged and took 8 flushes to clean it . Would clean it would stop again. Have heat now .
Thank you everyone for helping.
SOURCE: No heat coming out fan blows but no heat
you could have air trapeed in the cooling system. If so, go to shop with evac/fill equipment to burp the air.
ALso, feel the heater hose going into the heater core and out of the heater core. They should be hot. They are about 1 inch round and go into the firewall behind the engine.
Is the engine temperature normal? If not, replace the thermostat.
I assume you have electronic system since you said you push a button. Perform this test and get codes
The On-Board Diagnostic should be deactivated before powering the system down (system turned OFF). Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.
EATC SYSTEM ON-BOARD DIAGNOSTIC TROUBLE CODE CHART
Trouble Code
Detected Condition
Action
024
Fault in blend door calibration during self test
GO to Pinpoint Test B .
025
Intermittent fault in blend door calibration
GO to Pinpoint Test B .
030
On-Board Diagnostic indicates automatic temperature control sensor shorted
GO to Pinpoint Test G .
031
On-Board Diagnostic indicates automatic temperature control sensor open
GO to Pinpoint Test G .
040
On-Board Diagnostic indicates ambient sensor short
GO to Pinpoint Test C .
041
On-Board Diagnostic indicates ambient sensor open
GO to Pinpoint Test C .
042
Ambient sensor intermittent short
GO to Pinpoint Test C .
043
Ambient sensor intermittent open
GO to Pinpoint Test C .
050
On-Board Diagnostic indicates sunload sensor short
GO to Pinpoint Test D .
052
Sunload Sensor intermittent short
GO to Pinpoint Test D .
115
Intermittent engine coolant temperature signal
GO to Pinpoint Test N or Pinpoint Test P .
125
Intermittent vehicle speed signal
GO to Pinpoint Test N or Pinpoint Test P .
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