Friedrich 9 Electronic control error codes diagnostics and test mode, Diagnostics, Test Mode

electronic control error codes diagnostics and test mode (Continued)

The chart below lists the possible error codes and their description:

Error
Code	Code Translation	Action Taken by Unit	Possible Cause
EF	“Error Free” - No Codes Stored	None	Unit Operating Normally
02	An extreme low voltage condition	Shut down unit. Display Error code and	• Inadequate power supply
	exists <198V for 230V units and	￿ash. Once voltage rises to normal level	• Defective breaker
	<239V for 265V units.	system power is restored.	• Blown fuse
03	Return air thermistor sensor open or	Set return air sensor = 75°F. Alternately	• Defective sensor
	short circuit	￿ash set point and error code. Leave unit
		running.
04	Indoor coil thermistor sensor open or	Set ID coil temp = 40°F. Alternately ￿ash	• Defective sensor
	short circuit	set point and error code. Leave unit running.
05	Outdoor coil thermistor sensor open	Set OD coil temp = 20°F. Alternately ￿ash	• Defective sensor
	or short circuit	set point and error code. Automatically
		change over to Electric heat Mode only.
		Leave unit running.
06	If O.D. coil Temperature > 175° F for	Alternately ￿ash set point and error code.	• Dirty coil
	2 consecutive minutes. (Heat Pump	Shut unit down for 5 minutes, then try again	• Fan motor failure
	models only)	2 times, if fails the 3rd time then shut down	• Restricted air ￿ow
		unit.	• Non-condensables in refrigeration system
07	I.D coil temperature <30° F for 2	Alternately ￿ash set point and error	• Dirty ￿lters
	consecutive minutes.	code. Continue fan operation while the	• Dirty coil
		compressor is locked out until the indoor	• Fan motor failure
		coil thermistor reaches 45° F, then energize	• Restricted air￿ow
		the compressor. However, compressor	• Improper refrigerant charge
		must still wait a lockout time of 180 to 240	• Restriction in refrigerant circuit
		seconds.
08	Unit cycles (Heat or Cool demand) >	Store error code in memory.	• Unit oversized
	9 times per hour	Keep unit running	• Low load conditions
09	Unit cycles (Heat or Cool demand) <	Store Error Code in memory.	• Unit undersized
	3 times per hour	Keep unit running	• High load conditions
10	Room Freeze Protection triggered	Alternately ￿ash set point and error code.	• Room temperature fell below 40°F
		Keep unit running.
11	No Signal to “GL or “GH” terminal	Shut down unit. Display error code and	• Defective remote thermostat
		￿ash.	• Defective thermostat wiring
13	High Pressure switch open	Turn OFF compressor. Flash error code	• Dirty coil
VPAK			• Fan motor failure
24K BTUs			• Restricted air flow
ONLY
			• Non-condensables in refrigeration system

Diagnostics

The Friedrich Smart Center continuously monitors the VPAK unit operation and will store service codes if certain conditions are witnessed. In some cases the unit may take action and shut the unit off until conditions are corrected. To access the error code menu press the ‘Heat’ and ‘High Fan’ buttons simultaneously for three sec- onds. If error codes are present they will be displayed. If multiple codes exist you can toggle between messages using the temp up button. To clear all codes press the temp down button for three seconds while in the error code mode. To exit without changing codes press the ‘Low Fan’ button.

Test Mode

For service and diagnostic use only, the built-in timers and delays on the VPAK may be bypassed by pressing the ‘Cool’ and ‘Low Fan’ buttons simultaneously for three seconds while in any mode to enter the test mode. CE will be displayed when en- tering test mode, and OE will be displayed when exiting. The test mode will automatically be exited 30 minutes after entering it or by pressing the ‘Cool’ and ‘Low Fan’ buttons simultaneously for three seconds.

Note: To access the Test Mode while under remote wall thermostat operation, remove thermostat’s wires at the terminal block on the electronic control board then connect a jumper wire between GL and GH.

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