Heating, Air Conditioning, Fridge, HVAC/G6RA furnace won't start

Advertisement


Question
I have a G6RA 80+ Nordyne upflow furnace.  The A/C works fine.  The gas heat doesn't come on.  I have 24v call for heat at the wire block on the red and white wires.  I have 3 flashes (pressure switch stuck closed) followed by 6 flashes.  I read a few posts that said to test by jumping the two pressure switch wires.  I jumped the wires and still no start, and only 3 flashes show, and no 6 flashes.  The pressure switch wires showed 24 volts.  The ignition module shows 15.5 volts when tested to ground.  I think it is supposed to show 24 volts.  The inducer does not come on, nor does the igniter or gas.  Does this indicate a bad relay on the control board?

Answer
John,

The first thing that suppose to run on a call for heat would be the inducer motor, so you would need to check to see where your losing power at the motor wires. Possible the motor is bound up and can not start. The pressure switch suppose to be open at all times ,closes only when ventor motor reaches correct RPM of motor and nothing is plugged  on any hoses. If all your safety limit switches did not trip then your ignition should start. try jumping the R to W terminal at the board at the furnace .Look at your wiring diagram to see where the 120 volt feeds the motor and start there.

Heating, Air Conditioning, Fridge, HVAC

All Answers


Answers by Expert:


Ask Experts

Volunteer


Joe

Expertise

40+ years diversified experience.An HVAC/Refrigeration Self Employed Contractor since 1986. NATE Certifield. Answer questions pertaining to Residential and Commercial Air Conditioning , Warm Air Heating, Heat Pump systems.Mechanical and Electrical troubleshooting of these systems.Be as detailed as possible when describing problem.Packaged unit or split systems.No appliance questions.

Experience

Installation and Troubleshooting, Mechanical and Electrical, in following areas, Refrigeration ( Walk In and Reach In Coolers and Freezers ) Commercial Roof Top and Packaged Heating/Cooling ( Natural Gas,Propane, Electric, and Heat Pumps ) Computer Room Air Conditoning Systems,Commercial Residential Packaged and Split Systems Air Conditoning and Heat Pumps.Warm Air Oil , Natural and Propane Gas Heating systems.

Education/Credentials
Graduated from Private Technical School in 1975. An HVAC/Refrigeration Contractor . Have Unlimited Heating/Piping and Cooling Contractor License.Limited Sheetmetal Contractors License.NATE Certifield. York Certifield Master Heat Pump Technician 1986. Served 33 years combination Active Duty Air Force , Air Force Reserves and Air National Guard in the HVAC/Refrigeration Shop/Mechanical Shop. Troubleshooting/Installing HVAC/Refrigeration Equiptment Worldwide. Retiring in 2003 as a Senior NCO ,and a Mechanical Superintendent.

©2016 About.com. All rights reserved.