Before You Call For Service - American Standard HPWH50G-AS Owners And Operation Manual

HEAT PUMP WATER HEATER

BEFORE YOU CALL FOR SERVICE

Problem
Relief valve producing
popping noise or draining.
Unit is not making noise.
ERROR CODE
E0
E1
E4
E5
E6
E8
P0
P2
P4 COMPRESSOR CURRENT IS TOO HIGH
P8 UPPER ELEMENT CURRENT IS TOO LOW
PA
P5
C0
24
Possible Causes
Pressure buildup by thermal
expansion to a closed system.
If unit is using resistance elements, it
will not make noise.
MEANING
T2 SENSOR MALFUNCTION
T3 SENSOR MALFUNCTION
Th SENSOR MALFUNCTION
T4 SENSOR MALFUNCTION
T5 SENSOR MALFUNCTION
Water temperature is too high
（T2>=165° F ）
EVAPORATER TEMP. BELOW 32° F
AIR DISCHARGE HIGH TEMP
PROTECTION
LOWER ELEMENT CURRENT IS TOO
LOW
AIR FILTER IS TOO DIRTY
ABNORMAL POWER SUPPLY
What to Do
• This is an unacceptable condition and must be
corrected. Contact your water supplier or a
plumbing contractor for directions to correct
this issue. Do not plug the relief valve outlet.
• Check mode of unit.
ACTIONS / SOLUTIONS
CHECK WIRES FOR DAMAGE
CHECK WIRES CONNECTIONS FROM SENSOR TO CONTROL BOARD
CHECK T2 FOR INTERFERENCE WITH STRONG MAGNETIC FIELD
CHECK ACTUAL TEMP. SHOULD BE BETWEEN IN 32° F - 140° F
CHECK WIRES FOR DAMAGE. MEASURE RESISTANCE FROM CONTROL BOARD CONNECTION.
CHECK WIRE CONNECTIONS FROM SENSOR TO CONTROL BOARD
CHECK T3 VERIFY IF SENSOR IS DAMAGED USING OHMMETER
CHECK T3 FOR INTERFERENCE WITH STRONG MAGNETIC FIELD
CHECK ACTUAL TEMP. SHOULD BE BETWEEN 23° F-86° F (TOLERANCE +9° F)
CHECK ELECTRONIC EXPANSION VALVE FOR DAMAGE
CHECK WIRES FOR DAMAGE. MEASURE RESISTANCE FROM CONTROL BOARD CONNECTION
CHECK WIRE CONNECTIONS FROM SENSOR TO CONTROL BOARD
CHECK Th SENSOR FOR DAMAGE
CHECK Th FOR INTERFERENCE WITH STRONG MAGNETIC FIELD
CHECK ACTUAL TEMP. SHOULD BE BETWEEN 41° F-95° F
CHECK WIRES FOR DAMAGE. MEASURE RESISTANCE FROM CONTROL BOARD CONNECTION
CHECK WIRE CONNECTIONS FROM SENSOR TO CONTROL BOARD
CHECK T4 SENSOR FOR DAMAGE
CHECK T4 FOR INTERFERENCE WITH STRONG MAGNETIC FIELD
CHECK ACTUAL TEMP. SHOULD BE BETWEEN IN 68° F-221° F (TOLERANCE +9° F)
CHECK REFRIGERANT TUBING FOR DAMAGE
CHECK FOR REFRIGERANT LEAKAGE
CHECK WIRES FOR DAMAGE. MEASURE RESISTANCE FROM CONTROL BOARD CONNECTION
CHECK WIRE CONNECTIONS FROM SENSOR TO CONTROL BOARD
CHECK T5 SENSOR FOR DAMAGE
CHECK T5 FOR INTERFERENCE WITH STRONG MAGNETIC FIELD
CHECK IF T2 SENSOR WIRING IS BROKEN
CHECK IF T2 SENSOR TERMINAL CONNECTION IS STABLE
CHECK IF THE T2 SENSOR CAN ACCURATELY DETECT THE TEMPERATURE
CHECK IF UPPER/LOWER ELECTRIC HEATERS & COMPRESSOR RELAY CONTROL IS WORKING NORMALLY
DISAPPEAR WHEN EVAPORATER TEMP. HIGHER THAN 32° F
CHECK FOR ANY REFRIGERANT LEAKAGE
CHECK PRESSURE IN THE REFRIGERANT SYSTEM
CHECK THE SUPPLY VOLTAGE < 198 VAC
CHECK COMPRESSOR FOR DAMAGE
CHECK UPPER ELEMENT RESISTANCE
CHECK CONNECTIONS FROM UPPER ELEMENT TO CONTROL BOARD
CHECK UPPER ELEMENT RELAY
CHECK LOWER ELEMENT RESISTANCE
CHECK CONNECTIONS FROM LOWER ELEMENT TO CONTROL BOARD
CHECK UPPER ELEMENT RELAY
CLEAN THE AIR FILTER
CHECK POWER, VOLTAGE AND FREQUENCY
CHECK POWER WIRE, COULD BE LOOSE OR BROKEN