Sanyo TH3672R, UH2672R Service procedures Symptoms and Parts to Inspect, Contents Correction

4. Service procedures

4-2. Symptoms and Parts to Inspect

Remote	Alarm	Judgment condition	Clear condition		Judgment and
controller	contents				correction
alarm display
P03	Abnormal discharge	Stops when temp. exceeds	Recovery at restart	1. Check refrigerant cycle
	temperature	232 ˚F.		(gas leak).
	• Discharge temp.			2. Electronic control valve
	detected at or			trouble
	above the specified			3. Check tubing sensor (TD).
	value.
P04	High pressure	Stops when pressure	Recovery at restart	1. Check the high pressure
	switch is activated.	exceeds 600 psi.		switch connector is
	Compressor motor	Stops when temp. exceeds		securely connected.
	thermal protector is	230 ˚F.		2. Check the ourdoor unit heat
	activated.			exchanger is not clogged
				(cooling operation).
				3. Check the indoor unit air
				filter has not become
				clogged (heating operation)
P05	Missing phase	Current value sent from MDC	Recovery at restart	1. Check R/S/T power.
	detected. (CT	on outdoor unit control PCB is		2. Check inverter control PCB.
	disconnected or AC	low.		3. Check outdoor unit control
	power trouble)	No AC power input for 3		PCB.
		minutes or longer: pre-trip - 5
P15	Insufficient gas level	The following conditions	Recovery at restart	Check refrigerant cycle
	detected.	continue for 1 minute.		(gas leak).
		• Discharge temp. is 203 ˚F or
		higher.
		• Electronic control valve is at
		step 480.
		• Current value from MDC is
		2.0 A or less.
P19	4-way valve locked	Indoor heat exchanger temp.	Recovery at restart	1. Check 4-way valve.
	• Judgment occurs	drops although compressors		2. Check 4-way valve wiring.
	after compressor	are ON in heating mode:		3. Check outdoor unit control
	has been ON for 5	[min(E1, E2)] ≤ 50 ˚F.		PCB.
	minutes.	Indoor heat exchanger temp.
		rises although compressors are
		ON in cooling mode:
		E2 ≥ 104 ˚F.
P20	High-pressure	If MAX (C1,C2) is 142°F or	Recovery at restart	1. Refrigerant cycle
	protection trouble	higher, the compressor stops		overload operation
		one. The compressor restarts		2. Outdoor coil temperature
		three time, and if the		sensor C1 or C2
		temperature does not
		decrease to less than 142°F,
		the alert “P20” is displayed.
P22	Outdoor unit fan	Inverter stops after alarm is	Recovery at restart	1. Position detection trouble
	motor trouble	detected		2. Overcurrent protection
	• Inverter protection			circuit at outdoor unit fan
	circuit was			motor was activated.
	activated, or lock			•	Check outdoor unit control
	was detected, at				PCB.
	outdoor unit fan			•	Refer to outdoor unit fan
	motor.				judgment methods.
P26	Inverter protection	Inverter stops after alarm is	Recovery at restart	1. Stops immediately when
	circuit was	detected. Alarm is output		restarted.
	activated, or G-Tr	when inverter stops (pre-trip)		•	Layer short in the
	short-circuit (short	consecutively 4 times.			compressor
	time: 0.8 s or less)			2. Check inverter control
	in inverter control			PCB.
				•	Wiring trouble
					SM831148

IV-5

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