Mitsubishi Electric PAR-W21MAA Instruction Book page 17

<Flashing Error Codes>
HOT WATER SUPPLY AIR TO WATER Models
Error Code
HOT WATER SUPPLY
AIR TO WATER unit No.
If you have entered contact number to be called in the event of a problem, the screen displays this number.
(You can set this up under Function Selection of remote controller. For information, refer to section 6.)
If the ON lamp and error code are both flashing: This means that the unit is out of order and operation has been stopped (and cannot resume). Take note of the indicated unit
number and error code, then switch off the power to the unit and call your dealer or servicer.
Example A
Error Code
If only the error code is flashing (while the ON lamp remains lit): Operation is continuing, but there may be a problem with the system. In this case, you should note down the
error code and then call your dealer or servicer for advice.
* If you have entered contact number to be called in the event of a problem, push the Check button to display it on the screen. (You can set this up under Function Selection of
remote controller. For information, refer to section 6.)
FLOW TEMP. CONTROLLER Models
ON lamp
(Flashing)
Refrigerant Address
Example B
Error Code
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Error Code FLOW TEMP. CONTROLLER unit No.
Alternating Display
When the Check button is pressed:
ON lamp
(Flashing)