Geothermal Heat Pump: Climatemaster Re: Diagnostic Codes CXM Board - Most older Climatemaster Geothermal heat pumps use the CXM Control Board. The CXM board has a diagnostic function that will cause the unit to go into a "lockout" if an abnormal operating condition occurs. When the CXM...

York Gas Furnaces Re: Lockout Codes Most York gas furnaces have a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace. Diagnostic Codes: Slow Green Normal Operation - no call for heat Slow...

Fujitsu Mini-Split Re: Error A1 Error Code A1 = High Compressor Discharge Temperature Also indicated on the control board by 10 Green flashes and 1 Orange flash. Qty Possible Causes: 3 Low Refrigerant Charge Bad Sensor CHECKOUT: 1. Check Unit...

Geothermal Heat Pump: Waterfurnace Re: Diagnostic Codes These units can have either an Aurora Base Control (ABC) or an Aurora Expansion Board (AXB). The ABC board has a diagnostic function that will cause the unit to go into a "lockout" if an abnormal operating condition occurs. When the...

Honeywell Thermostat: TH4110U T4 Pro Re: Installer Setup Options 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 setup options. Press "+" or "-" to change values. Press...

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 Causes: 10 Dirty Flame Sensor 3 Bad...

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 control will operate the supply air blower and...

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 power to the furnace or by turning the thermostat...

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 opens Five Times within a single call for heat, the...

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 "-" to change values. Press "Select" to confirm...