Product data

HWError Code.doc MORE ON NEXT PAGE 02/09/01
High Wall Diagnostic Codes
Error Code
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Error Check/Action
2
Room Air thermistor malfunction
If system reads thermistor value:
Short condition: greater or = 194 deg F
Open condition: less or = -40 deg F
Check plug connection on main circuit board (CN9).
Check resistance of thermistor:
Short: Resistance less than 1.0 ohm
Open: Resistance is infinity
If out of range replace thermistor.
3
Indoor Coil thermistor malfunction
If the following occurs with thermistor:
Short condition: greater or = 194 deg F
Open condition: less or = -40 deg F
Check plug connection on main circuit board (CN9).
Check resistance of thermistor:
Short: Resistance less than 1.0 ohm
Open: Resistance is infinity
If out of range replace thermistor.
4
Outdoor Coil thermistor
malfunction
If the following occurs with thermistor:
Short condition: greater or = 194 deg F
Open condition: less or = -40 deg F
Check plug connection on main circuit board (CN17).
Check termistor cable connection at terminal board on
indoor and outdoor unit.
Check resistance of thermistor:
Short: Resistance less than 1.0 ohm
Open: Resistance is infinity
If out of range replace thermistor.
5
Applicable for
00 9 & 012 units
only
Compressor Drive malfunction
Indoor coil thermistor needs to change
3.5F within 5 min after start of
compressor.
Check control wiring connections between indoor and
outdoor units. Control voltage for 009 & 012 is line voltage.
Check indoor coil thermistor for proper placement
Check for refrigerant leaks.
Check OHM on compressor winding , OLP, capacitor
Winding Resistance ohms (cold comp @ 70f +
2%):
38AN009-100 & 38BK009-110 SC= 5.140, RC= 0.767
38AN012-300 & 38BK012-300 SC= 5.630, RC= 2.170
38AN012-310 & 38BK012-310 SC = 4.780, RC= 2.240
Check indoor and outdoor terminal block for power supplied
from indoor relay (y-cooling, 3-heat pump).
Check compressor contactor.
6
Applicable for
009 & 012 only
009 & 012
energize in
heating
18 & 24 energize
in cooling
Reversing Valve malfunction
After 5 minutes of operation, indoor coil
temperature changes by 3.5F in opposite
direction of mode selected
.
Check control wiring connections between indoor and
outdoor units. The control voltage for 009 & 012 is line
voltage.
Check voltage at TB of indoor unit:
12: check between 1 & L2 – 230V
9: check between 1 & N – 115V
If no voltage replace Relay board. Continue if voltage
measured.
Check voltage at TB of outdoor unit.
Check Voltage at reversing valve.
Replace reversing valve if not energized.