Question about Heating & Cooling

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When i touch the mode button to turn on the heat , the AC fan comes on and will not shut off unless i push the mode button to turn everything off.

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  • 296 Answers

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

Posted on Mar 30, 2019

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On what, exactly.?

Posted on Mar 30, 2019

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Posted on Jan 02, 2017

Anonymous

  • 288 Answers

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.

Posted on Dec 18, 2007

Anonymous

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.

Posted on Jul 13, 2008

Anonymous

  • 166 Answers

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

Posted on Sep 07, 2008

Anonymous

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.

Posted on Sep 20, 2008

gerry bissi

  • 4388 Answers

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

  1. If inspection reveals obvious concern(s) that can be readily identified, service as required. If the concern(s) remains after the inspection, perform the following EATC On-Board Diagnostic:
  1. NOTE: If sent to this section from Section 18-04, perform the EATC On-Board Diagnostic, record any or all diagnostic trouble codes (DTCs).


    • The EATC On-Board Diagnostic will detect concerns in the system control functions found during the On-Board Diagnostic and will display (DTCs) in addition to intermittent (DTCs) for concerns that occur during system operation. The vehicle interior temperature should be between 16° and 27°C (60° F and 80° ) F when performing the On-Board Diagnostic. If the temperatures are not within the specified ranges, false in-car temperature sensor error codes will be displayed. Record all error codes displayed during the test.
    • If any (DTCs)appear during the On-Board Diagnostic, follow the diagnostics procedure given under ACTION for each DTC given.
    • If a condition exists but no (DTCs) appear during the On-Board Diagnostic, refer to the Symptom Chart Condition: EATC System Inoperative, Intermittent or Improper Operation .
    • The On-Board Diagnostic can be initiated at any time with any resulting DTCs displayed. Normal operation of the system stops when the On-Board Diagnostic is activated.
    • To enter the On-Board Diagnostic, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds.
    • To exit On-Board Diagnostic and retain DTCs, push the blue (cooler) button. The control will exit On-Board Diagnostic, retain all DTCs and then turn OFF (display blank).
    • To exit On-Board Diagnostic and clear all DTCs, press Defrost button. The vacuum fluorescent display window will show 000 and all function symbols for one second. Then, the EATC Control will turn OFF (display blank) and all DTCs will be cleared.
    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 .

Posted on Feb 28, 2010

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2 Answers

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.

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