34
PTAC-SVX004A-EN
Table 8. Digital Display Error Codes (continued)
Control
Board
Display
Status LED -
Number of
Flashes
Followed by 3
second delay
Code Description Explanation Troubleshooting
H3
(a)
Green Light On
Constant (Normal
Operation)
Overload protection
detection
Voltage is too low / condenser
coil dirty / outdoor fan damaged
/ compressor failed
1. Power supply voltage is low.
2. Condenser coil is dirty.
3. Outdoor fan is damaged or failed.
4. Compressor failed.
E5
(a)
Green Light On
Constant (Normal
Operation)
Overcurrent protection
of compressor
Voltage is too low / condenser
coil dirty / outdoor fan damaged
/ compressor failed
1. Power supply voltage is low.
2. Condenser coil is dirty.
3. Outdoor fan is damaged or failed.
4. Compressor failed.
A2
(a)
Green Light On
Constant (Normal
Operation)
Malfunction protection
for electric heat
Unit current is too high / electric
heater is damaged / open circuit
1. Power supply voltage is high.
2. Check for any breaks in the wires.
3. Replace the main board number two.
4. The indoor fan is damaged.
5. Replace the electric heater.
U5
(a)
Green Light On
Constant (Normal
Operation)
Unbalanced electric
current
All loads are stopped
1. Wires are not connected or inserted
correctly.
2. Electric heater is short-circuited or not
connected tightly.
3. There is an electric leakage.
A0
(a)
Green Light On
Constant (Normal
Operation)
Electric heater
combination wrong
All loads are stopped
1. Wires are not inserted correctly.
2. Electric heater is broken.
A4
(a)
Green Light On
Constant (Normal
Operation)
Electric heater current
abnormal
All loads are stopped
1. Part of electric heater is broken or
short-circuited.
2. Electric Heater is abnormal.
C7
(a)
Green Light On
Constant (Normal
Operation)
Temperature protection
time too long
All loads are stopped
1. Temperature limiter is broken.
2. Connection wire of loads of electric
heater is broken.
5 flashes (unit
remains
operational)
Freeze prevention
protection for
evaporator
Indoor tube temperature is too
low in cooling mode
6 flashes High temperature
protection for outdoor
condenser
7 flashes Frost prevention (heat
pump)
Outdoor tube temperature is low
in heat pump mode. This is
normal operation in cold outdoor
ambient temperatures. Electric
heat will cycle as needed.
8 flashes High temperature
protection for
evaporator
Indoor tube temperature is high
in heat pump mode.
9 flashes Wrong wire connection
indicated for wired
controller
(a)
These codes will only be shown on the unit display board. When a unit is being operated from a wireless or wired thermostat, the codes won't be visble.
Change Dip Switch 2 (down - disabling thermostat) to diagnose with controller. Remove power and power back up.
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