Symptoms That Are Not Malfunctions - Panasonic 2WAY Multi Technical & Service Manual

1. Symptoms that are not malfunctions

The following symptoms are characteristic operating conditions of this system and do not indicate malfunctions:
The fan fl aps on the indoor unit operate when the unit is stopped
If the compressor outlet pressure exceeds 3.5 MPa during heating operation, the fl aps on the stopped unit move to
horizontal and the fan rotates in the breeze.
When this happens, it may indicate a clogged air fi lter.
Inspect and clean if necessary.
Refrigerant noise is occasionally heard from the stopped indoor unit
During cooling operation of the outdoor unit, if the indoor unit is stopped for a period of time that equals the total
oil recovery time period while cooling (four hours), refrigerant will circulate in the stopped unit for four minutes,
so that refrigerant and oil can be recovered.
During heating operation of the outdoor unit, refrigerant will also fl ow in the stopped indoor unit, allowing
recovery of refrigerant and oil.
The fan in the outdoor unit rotates slowly
The outdoor unit fan can be completely stopped or rotated at various speeds by the control system, and will be fast
or slow as required. The fan is especially likely to stop or run slowly during cooling or heating operation when
outside temperatures are low.
During winter, the outdoor unit fan may rotate even when the engine is stopped.
The unit will not switch from cooling (dry) to heating, or from heating to cooling (dry)
• If "Being controlled by operation mode" is displayed
(When already being operated by another remote controller, the selectable operation modes are limited.)
When the following are displayed on the remote controller:
• If "Being controlled by operation mode" is displayed
(When already being operated by another remote controller, the selectable operation modes are limited.)
• If "Operation standby" is displayed
(In priority operation standby)
• If "Central control in progress" is displayed
(Operation is limited by the central control unit.)
• A display appears but then vanishes
("Valve open" or "water circulation" has been set with the outdoor main board menu item No. 4, test operation
forced setting.)
When the engine is started, an alarm displays on the 7 segment LED display.
Engine start standby is displayed during menu item No. 0, normal display.
If the unit is in start standby and each start condition is not accomplished when the engine is started, the
uncompleted start condition is displayed on the 7 segment LED. There are 5 types of start conditions, some that
start automatically after a set time, and some that become abnormal.
* See IV -1 4.-(3) for a list of startup conditions.
The outdoor unit does not operate at all
• The temperature controller is operating (thermo-off).
Cooling is poor/heating is poor
• Is the temperature controller (remote controller temperature) properly set?
Is there too much load on the air conditioner?
• During demand control, because the unit operates at below the set fuel gas fl ow control value, cooling may be
slightly bad (heating may be slightly bad).
"Inspect oil" fl ashes on the remote controller.
When the operating hours for the gas engine reach a designated time, "Inspect oil" fl ashes.
Change the engine oil.
If the engine oil is not changed within 200 operating hours after fl ashing, warning A02 will be displayed and
operation will stop.
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