Toyotomi MUL12- FWCA, Service Manual

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CONTROL
2) Memory
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memory states between memory on and memory off. When this function is activated, Memory will be displayed. If this
function is not set, the unit will be under the “Off” state after power failure and then power recovery.
Memory recovery: If this function has been set for the wired controller, the wired controller after power failure
will resume its original running state upon power recovery. Memory contents: On/Off, Mode, set temperature, set fan
speed, Save function and Lock function.
3) Enquiry of the Outdoor Ambient Temperature
Under the “On” or “Off” state of the unit, press Enter/Cancel for 5s, and the outdoor ambient temperature will be
displayed after a sound of click. This enquiry state will quit by pressing Function or On/Off or during the temperature
adjustment. If there is not any operation for 10s, it will also quit automatically.
3.1.4 Errors
If there is an error occurring during the operation of the system, the error code will be displayed on the LCD. If
multi errors occur at the same time, their codes will be displayed circularly.
Note: In event of any error, please turn off the unit and contact the professionally skilled personnel.
Error Error Code
High pressure protection E1
Low pressure protection E3
Discharge protection E4
Over-current protection P5
Communication error E6
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E7
Anti-freezing protection E2
Defrosting or oil returning for heating H1
Indoor ambient temperature sensor open/short circuit F1
Evaporator temperature sensor open/short circuit F2
Indoor unit (liquid valve) refrigerant pipe inlet temperature sensor error b5
Indoor unit (gas valve) refrigerant pipe outlet temperature sensor error b7
Condenser coil inlet temperature sensor open/short circuit
A5
Condenser coil midway temperature sensor error
F4
Condenser coil outlet temperature senor open/short circuit
A7
Discharge air temperature sensor error F5
Outdoor ambient temperature sensor error F3
Module temperature sensor error oE
Outdoor unit overall error oE