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      On-demand appliance repair training videos for Professional Appliantologist members Over 30 hours (and growing!) of original, high quality appliance training webinars developed and given by yours truly are at your fingertips, on topics you won't find anywhere else. Fill in those knowledge gaps, strengthen those areas of uncertainty, and boost your skills. Watch on mobile or desktop at your convenience whenever, wherever.  Ultra Short Primer on Basic Electricity, Circuits, Ohm's Law, and Schematic Reading (Length: 1:04:48) Basic Refrigerator Troubleshooting (Length: 1:10:45) Schematic Reading Workshop, 10/2015 (Length 1:19:08) Troubleshooting Strategies for Computer-Controlled Appliances (Length: 48:34) Semiconductors and PN Junctions (Length: 1:04:37) Appliance Temperature Sensing Devices & Technology (Length: 1:27:33) Voltage Measurements, Meters, Ghost Voltages, and Triac-controlled Neutrals (Length: 1:29:32) Troubleshooting with Tech Sheets, Part 1, 4/2016 (Length: 1:09:26) Troubleshooting with Tech Sheets, Part 2, 4/2016 (Length: 1:21:11) Tech Sheet Review, 4/9/2016: Bosch Speed Cooker, Amana Refrigerator, GE Glass Cooktop Range (Length: 1:22:58) Pulse Width Modulated (PWM) Switches used in Samsung Switched Mode Power Supplies (SMPS) (Length: 27:07) PWM Computer Cooling Fan in a Whirlpool Refrigerator (Length: 14:53) Understanding AC Split-phase Household Power Supplies (Length: 52:41) Troubleshooting a Samsung Electric Dryer without Disassembly using Live Tests and the Schematic (Length: 22:47) Troubleshooting a Bosch Dishwasher No-Heat Problem using the Schematic and Live Tests (Length: 15:38) Linear Motors and Linear Compressors (Length: 55:54) Bi-directional PSC Drive Motor Systems in Whirlpool VM Washers (Length: 56:52) Appliance Service Call Structure and Troubleshooting Strategies (Length: 1:00:16) The Ten Step Troubleshooting Tango and Workshop Exercises (Length: 1:35:39) Troubleshooting Ten-Step Tango Advanced Workshop (Length: 1:32:06) Ten-Step Tango Troubleshooting Workshop: Refrigerators (Length: 1:35:57) Whirlpool Duet Washer Schematic Analysis & Whirlpool Dryer Moisture Sensor System (Length: 1:03:04) Neutral Vs. Ground, Inverter Microwave, Digital Communications, Loading Down in DC loads, and more! (Length: 1:14:45) Gas Oven Service Call After a Parts Changing Monkey (Length: 36:04) AFCI and GFCI Circuit Protection Technology (Length: 41:26) Troubleshooting Samsung Refrigerators and more (Length: 1:29:58) 3-way Valves and Dual Evaporator Refrigerators (Length: 1:15:45) Split-Phase Compressors and PTC Start Devices (Length: 1:11:57) Gas Dryer Ignition Systems (Length: 53:50) Refrigerator Sealed System Thermodynamics, Part 1 (Length: 43:07) Refrigerator Sealed System Thermodynamics, Part 2 (Length: 1:09:09) Refrigerator Sealed System Thermodynamics, Part 3 (Length: 1:11:56) Refrigerator Sealed System Thermodynamics, Part 4 (Length: 37:45) Refrigerator Sealed System Thermodynamics, Part 5 (Length: 16:35) To access these webinars and all the other info-goodies here at Appliantology, become a Professional Appliantologist today. If you need cost-effective, time-flexible, state-of-the-art appliance technical training, check out the Master Samurai Tech Academy.
Scottthewolf

Carrier BDP Furnace, No heat

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Scottthewolf

Sorry, no model # due to it being worn off the furnace.  During the summer the air conditioner evaporator leaks condensate water on the fan control board and damages it.   Customer waited until the heating season to call me to tell me the blower fan runs 24/7 with no heat.  I replaced the fan control yet again telling the customer this is the last time I will do this, since she doesn't have money to replace the evaporator coil.

 

Now after replacing the fan control board, wiring the new one exactly like the old one, I get the ignitor lighting the pilot trying to constantly light the furnace burner with no attempts of the draft inducer or the blower motor coming on.  I checked the fan limit, it checks out good with continuity, I checked the draft inducer motor and it ohmed out good, and I checked the pressure switch on the draft inducer housing for continuity.  It all checked out good.  I also checked the resettable limit thermostat on the top of the furnace housing and that too checks out good with continuity.  The furnace blower motor now only works if you set the wall thermostat to run the fan on the "on" setting but it will not run if you set the wall thermostat on the "auto" setting.  What could be wrong???

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Cactus Bob

you checked the pressure switch ? with an ohm meter ?

 

did you remove the lines and install a long one to one of the ports and suck or blow into it to see if the contacts open and close ?

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Scottthewolf

yes, checked both of the above.

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Cactus Bob

is the new board the programable type , with dip switches to use with multi oem boards ?

 

did the new board have an adapter harness , to adapt it to your furnance ?

 

i would guess you got a single wire in the wrong spot somehow

 

or you just have a bad new board

Edited by Cactus Bob

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Scottthewolf

It's an exact replacement, no adapter harness and non programable.

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RegUS_PatOff

... Sorry, no model # due to it being worn off the furnace.

hmmm ...

maybe post part number of Fan Control Board

(and any other Boards)

 

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Scottthewolf

Fan control board Robertshaw 695-101, which is an exact replacement for Carrier HH84AA021.

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RegUS_PatOff

some info:

 

Igniter Glows Red but Main Burner Will Not Light
Possible Causes:
Improper Igniter or Sensor Alignment
Faulty Ignition Control
Faulty Gas Valve
High Inlet Gas Pressures
Polarity Reversed
No Earth Ground

 

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jb8103

If the pressure switch is not proving, the furnace should not attempt to ignite. Without the draft inducer the pressure switch cannot be proving. Something else has gum in it.

 

This is an intermittent pilot type deal? Must be ancient.

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smasher711

Be sure you have it grounded and polarity correct

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