York TM9V080B12MP11 Error Code 7 Red Flashes: Ignition Failure - No Flame Detected

What Does Code 7 Red Flashes Mean?

The 7 red flashes code on the York TM9V080B12MP11 indicates the flame could not be established during three trials for ignition. The furnace has entered a one-hour soft lockout and will automatically try again after the lockout period.

During each ignition attempt, the igniter heats up, the gas valve opens, and the control board looks for a flame signal from the flame sensor. If no flame is detected within the trial period, the gas valve closes and the system retries. After three failures, it locks out.

The most common cause is a faulty or cracked hot surface igniter that cannot reach sufficient temperature to light the gas. The gas valve switch being in the OFF position is another common and easily fixable cause. A dirty flame sensor, low gas pressure, or a faulty gas valve are additional possibilities.

Common Causes

How to Fix It: Check Gas Valve and Clean Flame Sensor

What You'll Need

• 1/4-inch hex head driver or nut driver
• a Scotch-Brite pad
• Flashlight

Steps

1. Turn off electrical power at the breaker and shut off the gas supply valve Locate the furnace circuit breaker and flip it to OFF. Turn the gas shutoff valve to the OFF position (perpendicular to the pipe). If you smell gas, leave immediately and call your gas company.
2. Check the gas valve switch Locate the gas valve on the furnace. Make sure the valve switch is in the ON position. If it was off, this is likely the cause of the ignition failure.
3. Locate the flame sensor Open the furnace access panel and look near the burner assembly. The flame sensor is a thin metal rod (usually bent at an angle) mounted with a porcelain insulator. It has a single wire connected to it.
4. Remove the flame sensor Disconnect the wire from the flame sensor. Remove the mounting screw and carefully pull the sensor out. Handle it by the porcelain insulator or mounting bracket.
5. Clean the sensor rod Gently rub the metal rod with a Scotch-Brite pad until it is clean and shiny. Do not use regular steel wool alone, as it can leave fragments.
6. Reinstall the flame sensor Place the sensor back in its bracket, secure the mounting screw, and reconnect the wire.
7. Restore power and gas, then test Turn the gas supply valve to ON and flip the circuit breaker to ON. The furnace may need up to 1 hour to clear the lockout, or you can reset by cycling power. Set your thermostat to call for heat and watch the ignition sequence.

When to Call a Professional

Contact a licensed HVAC technician if:

• The igniter does not glow during the ignition sequence
• The gas valve was already in the ON position and the code persists
• You can hear gas flowing but it does not ignite
• The flame ignites but goes out within seconds
• You smell gas near the furnace

✓ Verified against manufacturer service manual — March 2026