https://ghac.makekb.com/ https://ghac.makekb.com/entry/390/ York Gas Furnace: TM9T Re: Flashing Code 6 Code 6 = Pressure switch opened (Code 3) 4 times during a run cycle. ► This is a "Soft Lockout" which will automatically reset after 1 hour. ► There are 3 pressure switches on this furnace. 1LP... Tue, 07 Apr 2026 16:36:00 +0000 https://ghac.makekb.com/entry/483/ York Gas Furnace: TG9S/GY9S Re: Flashing Code 11 This indicates that a primary or auxiliary limit switch has opened and has remained open for more than five minutes. This condition is usually associated with an air circulation failure. ►... Tue, 07 Apr 2026 14:34:07 +0000 https://ghac.makekb.com/entry/735/ Honeywell Thermostat: TH6220U/TH6320U T6 Pro Re: Add-On Heat Pump Setup To enter Installer Setup: Press and hold the "Center" button and the "+" button together for 3 seconds. Press "Select" to enter Setup. Press "Select" to cycle through... Thu, 12 Mar 2026 18:09:30 +0000 https://ghac.makekb.com/entry/398/ York Gas Furnace: PHU Re: No Heat - Code 7 Code 7 = Failure to Sense Flame Qty Possible Causes: 7 Dirty Flame Sensor 7 Bad Glow Plug 1 Clogged Burners 1 Bad Gas Valve No or Low Gas Pressure ... Thu, 12 Mar 2026 17:57:22 +0000 https://ghac.makekb.com/entry/516/ York 90% Gas Furnace: P3UR Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. Qty Possible Causes: 2 Bad Inducer Motor 1 Bad Pressure Switch 1 Clogged / Frozen Drain 1 ... Mon, 23 Feb 2026 16:46:52 +0000 https://ghac.makekb.com/entry/788/ Nordyne Gas Furnace: G6RC Re: Flashing Code 1 Code 1 = Limit switch open If the limit control opens, the burners will be de-energized and the air circulation and vent blower will be turned on until the limit closes. The diagnostic light... Thu, 12 Feb 2026 16:07:48 +0000 https://ghac.makekb.com/entry/688/ Amana Gas Furnace: GULA Re: Flashing Code 4 Code 4 = Main limit switch (auto-reset) has opened its normally closed contacts, or the Blower Auxiliary Limit (manual-reset) has tripped. The control will operate the supply air blower and inducer... Tue, 10 Feb 2026 14:22:28 +0000 https://ghac.makekb.com/entry/478/ York Gas Furnace: TG9S/GY9S Re: Flashing Code 4 Code 4 has two possible meanings: Code 4 = Limit switch circuit is currently open. If the limit switch circuit opens during a call for heat, the control will indicate 4 Red Flashes. ►... Mon, 09 Feb 2026 14:38:14 +0000 https://ghac.makekb.com/entry/474/ York Gas Furnace: TG9S/GY9S Re: No Heat - Flashing Code 7 Code 7 = Three consecutive failed ignition attempts (failed to sense flame). ► This is a "Soft-Lockout" which will automatically reset/retry after 1 hour. Qty Possible... Mon, 02 Feb 2026 22:32:04 +0000 https://ghac.makekb.com/entry/386/ York Gas Furnace: TM9Y Re: Flashing Code 4 Code 4 has two possible meanings: Code 4 = Limit switch circuit is currently open. If the limit switch circuit opens during a call for heat, the control will indicate 4 Red Flashes. ► The... Sun, 01 Feb 2026 20:47:31 +0000 https://ghac.makekb.com/entry/374/ York 80% Gas Furnace: GY8S Re: Flashing Code 7 / Error Code 7 Flashing Code 7 = Lockout due to ignition retries. Caused by multiple failed ignition attempts. ► Code 7 is a Hard Lockout that disables heat operation and must be reset by cycling... Fri, 30 Jan 2026 14:22:49 +0000 https://ghac.makekb.com/entry/756/ York Gas Furnace: Y81E/Y91E Re: Flashing Code 4 Code 4 = Main limit switch has opened its normally closed contacts. The control will operate the supply air blower and inducer while the open limit condition exists. ► If the main limit switch... Wed, 21 Jan 2026 18:37:13 +0000 https://ghac.makekb.com/entry/790/ Honeywell Thermostat: TH6320WF T6 Pro Wi-Fi Re: Installer Setup Options To enter Installer Setup: Press and hold the "MENU" button for 5 seconds. Press "Select" to enter Setup. Press "Select" to cycle through setup options. Press "+" or... Mon, 19 Jan 2026 19:45:20 +0000 https://ghac.makekb.com/entry/683/ Goodman Gas Furnace: GMH95/ GCH95 Re: Flashing Code 4 Code 4 = Main limit switch (auto-reset) has opened its normally closed contacts, or the Blower Auxiliary Limit (manual-reset) has tripped. The control will operate the supply air blower and... Tue, 13 Jan 2026 18:00:51 +0000