Troubleshooting Instructions; Error Code Trouble Shooting - A.O. Smith CAHP-MC-38 Installation, Operation And Maintenance Instructions

12.1. Error Code Trouble Shooting

Please try to do the trouble shooting based on the error code information before call the service call if
the central controller reported a error code.
CODE ERROR DESCRIPTION
Central Controller
E00-01 RESERVED
E00-02 RESERVED
E00-03 RESERVED
E00-04 RESERVED
TANK TEMPERATURE SENSOR
E00-05
ERROR
AUXILIARY HEATER TANK
E00-06
TEMPERATURE SENSOR ERROR
AUXILIARY HEATER FLOW SWITCH
E00-07
ALARM
E00-08 TANK TEMPERATURE OVERHEAT
EEROR
AUXILIARY HEATER FLOW SWITCH
E00-09
LOCK
E00-10 ABNORMAL TANK TEMPERATURE
E00-11 SYSTEM WATER FLOW ERROR
E00-12 HIGH VOLTAGE ALARM
E00-13 LOW VOLTAGE ALARM
E00-14 CONDENSER CLEAN ALARM
HEAT PUMP 0X 0 1~08
（ （ （ （ ） ） ） ）
E0X-00 COMMUNICATION ERROR

8 - Troubleshooting Instructions

POSSIBLE REASONS
1. Loose wiring.
2. Bad temperature sensor.
1. Loose wiring.
2. No water, the valve had
been opened fully.
3. Too small water flow rate,
blocked water filter.
4. Bad switch.
Too hot water from auxillary
heater.
There are three times of E00-07
happpened within one hour.
1. Abnormal installation of the
tank temperature sensor or
control temperature sensor.
2. Bad tank temperature
sensor or control
temperature sensor.
All the heat pump units has water
flow switch error three times
within one hour.
The power supply voltage is
higher than 264V.
The power supply voltage is
lower than 187V.
Scalling condenser.
1. No power supply to the heat
TROUBLE SHOOTING STEPS
1. Inspect the wiring and fix
them.
2. Replace the temperature
sensor.
1. Inspect the wiring and fix
them.
2. Inspect the piping system
and make sure all the valves
are fully open.
3. Clean the water filter.
4. Replace the switch.
Inspect the control circuit of the
auxillary heater.
Power off and power on the
central controller. If there is still
E00-07 reported, please refer to
the trouble shooting method of
E00-07.
1. Inspect the two temperature
sensors installation on the
tank.
2. Replace the tank
temperature sensor or
control temperature sensor.
Inspect the heat pump water
piping line as per E0X-11 trouble
shooting.
Inspect the power supply system.
Clean the condenser.
1. Inspect the power supply to