Durham Region Air Conditioning Repair, Service and Installation
tempstar furnace codes
If you're looking for help fixing your tempstar furnace, look no further! Our comprehensive tempstar repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model's error codes.
CODE: Heartbeat LED pattern on solid.
RESULT: The control is locked out and will auto-reset after 1 hour.
FIX: Reset power to clear the lockout.
RESULT: The control is locked out and will auto-reset after 1 hour.
FIX: Reset power to clear the lockout.
CODE: Two LED flashes.
RESULT: Pressure switch didn't open.
FIX: Obstructed pressure tubing; a pressure switch that's stuck closed.
RESULT: Pressure switch didn't open.
FIX: Obstructed pressure tubing; a pressure switch that's stuck closed.
CODE: Three LED flashes.
RESULT: The low-pressure switch did not close or has reopened.
FIX: Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing.
RESULT: The low-pressure switch did not close or has reopened.
FIX: Proper vent sizing; air leak; restricted vent; clogged condensate drain; low input gas pressure; excessive wind; improper pressure switch wiring; water in vent piping; disconnected or obstructed pressure tubing.
CODE: Four LED flashes.
RESULT: Limit circuit fault.
FIX: Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch.
RESULT: Limit circuit fault.
FIX: Loose blower wheel; defective switch or connections; improper minimum- or maximum-heat gas input adjustment; dirty filter or restricted duct system; improper limit switch.
CODE: Five LED flashes.
RESULT: Abnormal flame-proving signal.
FIX: Leaky gas valve; stuck-open gas valve.
RESULT: Abnormal flame-proving signal.
FIX: Leaky gas valve; stuck-open gas valve.
CODE: Six LED flashes.
RESULT: Ignition proving a failure.
FIX: Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn't be grounded.
RESULT: Ignition proving a failure.
FIX: Low inlet gas pressure; control ground continuity; gas valve defect; defective hot surface igniter; oxide buildup on the flame sensor; inadequate flame carryover; flame sensor mustn't be grounded.
CODE: Seven LED flashes.
RESULT: Limit circuit lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4.
RESULT: Limit circuit lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4.
CODE: Eight LED flashes.
RESULT: Gas heating lockout.
FIX: Gas valve stuck closed on control.
RESULT: Gas heating lockout.
FIX: Gas valve stuck closed on control.
CODE: Nine LED flashes.
RESULT: Medium pressure switch, high-pressure switch, or PSR relay didn't close or was reopened.
FIX: Refer to status code #3.
RESULT: Medium pressure switch, high-pressure switch, or PSR relay didn't close or was reopened.
FIX: Refer to status code #3.
CODE: Ten LED flashes.
RESULT: Polarity.
FIX: Correct line voltage polarity.
RESULT: Polarity.
FIX: Correct line voltage polarity.
CODE: Status codes 1 + 2.
RESULT: Blower on after power up.
FIX: Normal operation.
RESULT: Blower on after power up.
FIX: Normal operation.
CODE: Status codes 1 + 5.
RESULT: Blower motor lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4 + 1.
RESULT: Blower motor lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #4 + 1.
CODE: Status codes 3 + 5.
RESULT: Gas valve fault.
FIX: RED, YELLOW, or ORANGE wire at the gas valve.
RESULT: Gas valve fault.
FIX: RED, YELLOW, or ORANGE wire at the gas valve.
CODE: Status codes 4 + 1.
RESULT: Blower motor fault.
FIX: Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits.
RESULT: Blower motor fault.
FIX: Blower failed to reach 250 RPM, or the blower failed to communicate within the prescribed time limits.
CODE: Status codes 4 + 2.
RESULT: Inducer motor fault.
FIX: Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly.
RESULT: Inducer motor fault.
FIX: Proper vent sizing; restricted vent; failed inducer motor; improper motor wiring; a blockage in the tubing to the pressure switch assembly.
CODE: Status codes 4 + 3.
RESULT: The low or medium pressure switch is open while the medium or high-pressure switch is closed.
FIX: Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing.
RESULT: The low or medium pressure switch is open while the medium or high-pressure switch is closed.
FIX: Low inlet gas pressure; clogged condensate drain; improper pressure switch wiring; water in vent piping; low or medium pressure switch stuck open; disconnected or obstructed pressure tubing.
CODE: Status codes 6 + 1.
RESULT: Ignition lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #6.
RESULT: Ignition lockout.
FIX: Control will auto-reset after 3 hours. Refer to status code #6.
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
Feb 18, 2025
Amazing experience with TwinTech Heating & Cooling! Their team was professional, knowledgeable, and efficient from start to finish. They installed my new furnace quickly and left everything spotless. The technicians took the time to explain everything and made sure I was comfortable with the system before they left. Great customer service and fair pricing. I highly recommend them for anyone needing HVAC services!
Feb 18, 2025
Great experience all around. Bob was sharp and easy to talk to, and Greg handled the installation perfectly. Would hire them again in a heartbeat.
Aug 17, 2024
I returned from vacation to find my AC unit on the Fritz. After calling way too many places I connected with TwinTech. Ive used the company in the past for my furnace so I was happy when I recognized Greg at my front door. Hes great and the service is always top notch. Id highly recommend using twintech for honest, superior service in the Durham region. Thanks!
Aug 13, 2024
I called Twin Tech when my air conditioning stopped working. Greg came over to diagnose the issue - the same day. He was able to diagnose the issue and resolve it quite quickly. Although it was a quick fix, Greg was very thorough in explaining the issue and provided great advice. Not to mention, I felt very comfortable having Greg in my home - which I consider very important when hiring a service provider. Twin Tech will be my go-to from now on. Thank you!!
Aug 12, 2024
Just hired TwinTech Heating & Cooling to do an A/C Unit removal & reinstall to allow for landscaping access on the side of my house, and they were wonderful!
Bob, Greg & Mitch make a great team! Quick appointment times, super knowledgeable, expert troubleshooting capabilities & very customer service oriented.
I would highly recommend them for all of your HVAC needs! Great job guys!!
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tempstar furnace error codes
See What Our Customers Are Saying:
Aug 8, 2025
We are very happy to recommend this company to everyone. Our furnace broke down on Sunday morning. We phoned them and before noon Grant the owner showed up. He worked on the furnace for about a hour not wanting to give up to fix the problem. The furnace was 17 years old. I was the one talking about replacing it. End result was the next day it was all done. On the Sunday Bob came over with heaters to warm up the house. We decided to replace the water heater at the same time. Thanks Grant for the excellent work. Thumbs up.
Aug 8, 2025
Right on time. Explained how to work the HRV in a different way so the house would not be so dry. Changed my whole house water filter for me as well. Friendly, helpful, caring service!
Feb 18, 2025
Very pleased with the professional service that TwinTech Heating and Cooling provided in replacing my furnace. I got several quotes from different service providers. Their price was excellent and they explained the features very well. We are very glad we went with TwinTech and highly recommend their services.
Feb 18, 2025
We were new homeowners in need of a second opinion. TwinTech Heating & Cooling were Amazing and professional. Very knowledgeable and great service all around. Recommend to anyone looking for honest and reliable services. Treated with respect and care. Thank you Greg, Mitch and Bob!
Feb 18, 2025
TwinTech is an excellent and honest company! I called them for a second opinion after being told by another company that I needed to replace my furnace. Turns out this was not the case at all! I did not need a new furnace. TwinTech did not push to make an unnecessary sale and saved me from a huge expense. Bob and Mitch were extremely professional and above all honest! I definitely recommend TwinTech!
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- SUBMITTED BY:
- TWINTECH HEATING & COOLING
- - May 23, 2023
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- SUBMITTED BY:
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- SUBMITTED BY:
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Read MoreWhy is a Furnace Maintenance Check a Good Idea?
- SUBMITTED BY:
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- - September 13, 2023
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