tempstar Furnace Troubleshooting

Tempstar furnaces are widely known for their highly efficient and reliable HVAC systems. With their Energy Star Certification and strong warranty, many people go for their furnaces. However, if you’re facing issues with your Tempstar furnace, it may be time for a repair or maintenance call.

But before you go ahead and call a professional, you can troubleshoot some issues on your end. In this article, we’re discussing exactly that – from troubleshooting your Temstar furnace to understanding its error codes and more.

Common Issues with Tempstar Furnaces and How to Solve Them

When your furnace stops producing heat, several factors could be at play:

  • Thermostat Adjustments: Ensure the thermostat is switched to "heat" mode and set above the ambient room temperature.

  • Power Issues: Confirm the furnace's main switch is turned on and check if any circuit breakers have tripped. Also, verify that the furnace door is properly shut since an open door can halt operation.

  • Ignition Troubles: Depending on your model number it may or may not have a pilot light. Mostly, older models have them. So, check if the pilot light is working well. If your model uses electronic ignition and isn’t starting, you may need to reset the ignition system.

The blower motor is crucial for distributing warm air throughout your home. Tempstar has its unique ECM motor that is considered to be highly electrically efficient. So, if it fails, comfort levels can drop and energy bills may rise:

  • Capacitor Failure: A malfunctioning capacitor might prevent the blower motor from starting. A humming noise often signals this issue.

  • Motor Wear: Error codes displayed on the control board can point towards ECM motor problems. Visually inspect the motor for damage and test its functionality with a multimeter.

  • Airflow Obstruction: A dirty or clogged air filter can impede airflow, causing the motor to overheat and shut down. Replace the air filter if it appears dirty.

A furnace that frequently turns on and off might be experiencing:

  • Thermostat Issues: Incorrect thermostat calibration or placement can trigger frequent cycling. Position the thermostat away from direct heat sources and windows.

  • System Overheating: Limited airflow from closed or blocked vents can cause the furnace to overheat and cycle irregularly.

  • Flame Sensor Problems: A defective flame sensor may incorrectly sense the flame, causing the furnace to prematurely shut down. Clean the flame sensor with a fine abrasive to improve its accuracy.

Any strange noises from your furnace typically indicate an underlying issue:

  • Belt Squealing: This sound often suggests a belt that is either loose or deteriorating. Inspect and possibly replace the belt.

  • Loose Components: Rattling noises may stem from unsecured panels or screws. Tightening these components can help minimize the noise.

  • Bearing Issues: Grinding sounds might indicate worn bearings in the blower motor. If lubrication does not solve the problem, replacing the motor may be necessary.

A non-functional ignition system can leave your home without heat:

  • Safety Lockout: The furnace may enter a lockout mode after multiple unsuccessful ignition attempts. Resetting the furnace can sometimes clear this mode.

  • Gas Flow Interruptions: Check that the gas valve is open and inspect the gas line for blockages or leaks.

  • Worn Igniter: Over time, igniters can fail. Testing the igniter with a multimeter can determine if a replacement is needed.

Decoding Tempstar Furnace Error Codes

LED Flash Indications

Continuous Flash

Indicates normal operation with an active heat call.

Heartbeat Flashing

This signifies normal operation without a heat call.

Specific Error Codes

1 Flash

System lockout due to excessive retries or recycles.

2 Flashes

Indicates a pressure switch stuck open; check for obstructions in the exhaust pipe vents or issues with the pressure switch itself.

3 Flashes

 Suggests a pressure switch stuck closed; examine the pressure tubing for blockages.

4 Flashes

High limit switch is open, potentially due to a dirty filter, blocked ductwork, or an issue with the fan.

5 Flashes

Detects flame when none should exist; investigate a possible leaky gas valve or defective flame sensor.

6 Flashes

Ignition failure; verify gas flow, igniter functionality, and the condition of the flame sensor.

7 Flashes

Limit circuit lockout; this happens when the limit or flame rollout switch remains open for more than 3 minutes. Reset the power to clear this.

8 Flashes

Gas heating lockout; check if the gas valve is operational.

9 Flashes

Low flame detected; clean the flame sensor and ensure the burner and gas supply are functioning correctly.

10 Flashes

Incorrect polarity in power supply; confirm that the wires for power supply polarity are correctly working.

Tempstar furnaces communicate operational issues through error codes displayed as LED light sequences on the control board. These codes are essential for identifying problems:


Additional Multi-flash Codes

1+5 Flashes

Indicates a blower motor lockout; check the motor and capacitor for functionality.

2+4 Flashes

The secondary voltage fuse has blown; inspect for any short circuits.

3+5 Flashes

Points to a gas valve error; examine the wiring and connections of the gas valve installed.

4+1 Flashes

Alerts to a temperature rise that is too high or too low; assess the filter and overall airflow to decide if you need it replaced or cleaned.

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Furnace Troubleshooting Guides

Our comprehensive troubleshooting guide offers step-by-step solutions to common issues. From heating failures to airflow problems, we've got you covered."

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21:21 22 Jan 24
I had an issue with my furnace, went to reset my main breaker to power cycle trying to troubleshoot it... Breaker crapped out so I was sitting on an electrical, and furnace problem.Gave these guys a call and they were able to come out within 2 hours. Required a full main breaker replacement, and new gas valve on my furnace. They diagnosed it in only a couple hours, and fixed everything the same day.Had a great experience, the technicians that showed up were professional, and very knowledgeable. I'll definitely be using these guys when I eventually have replace my aging furnace.
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00:15 22 Jan 24
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21:40 13 Apr 23
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Understanding when to call an HVAC professional

While some issues can be handled on your own, a majority of them need the intervention of an HVAC professional – like those at Comfort Union. A lot of the ones mentioned above call for a quick inspection but one of the most dangerous issues is if your carbon monoxide detectors are alarming you. Call us immediately if you see this or if you see yellow flames instead of blue in your furnace.

We help our customers fix all the problems – be it with your natural gas furnace or with your air conditioning unit. Reach out to us to learn more and ask any questions about your furnace! We’ll be happy to answer all your queries in a correct and precise manner.

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