Cooling Overload Operation - Mitsubishi Heavy Industries FDTCVA SERIES Technical Manual

Error display : E35
4
Indoor unit
Red LED
Green LED Keeps flashing
± Models FDCVA151~251
Are the
characteristics of the
outdoor heat exchanger thermistor
normal?
NO
Replace the outdoor heat
exchanger thermistor.
Is the unit normal?
NO
Set temperature for protective control
Protective stop
Operable
(1)
48 65
Outdoor air temp. (ºC)
Note (1) The anomalous stop
temperature differs
depending on the
compressor's speed.

[Cooling overload operation]

Stays OFF Red LED
Green LED
YES
Is there cooling overload
operation?
Is high pressure control
normal?
Is there any gap between
actual temperature and
sensed temperature by
the microcomputer?
YES
The outdoor control PCB
is faulty. Replace it
Compressor speed Indoor heat exchanger
(rps) temprature (ºC)
min. to control range less than 88 65 or more
88 to less than 108 60 or more
108 or higher to max. 55 or more
Outdoor unit
1 time flash
Keeps flashing
Check the unit side.
• Is there a short circuit in the outdoor unit?
• Is the installation space proper?
• Is it overcharged?
• Is the heat exchanger dirty or clogged?
(1)When the following conditions are established, compressor speed is
reduced every minute down to the minimum speed at lowest.
Outdoor heat exchanger temperature: A˚C or higher
Outdoor air temperature: 40ºC or higher
The outdoor unit's fan runs at 7 speed continuously for 30 seconds
or longer.
(2) Control is cancelled when the temperature drops to BºC or lower.
Model
151~251
Display conditions
±
The error occurs when the outdoor heat exchanger tempera-
ture exceeds 65°C 5 times within 60 minutes, or is kept 65°C
or higher.
Outdoor unit heat exchanger
thermistor(Tho-R)
Resistance-temperature characteristics
15
10
5
0
272
- -
Item
min. to control
58.5
range less than 88
Compressor
speed
88 to less than 108 53.5
(rps)
108 or higher to max. 48.5
20 40 60
Temperature (ºC)
A B
53.5
48.5
43.5
80 100