P4 Outside Dish Prevent Overload Protection (Refrigeration) - Toyotomi KURO Mini Service Manual

P4 Outside dish prevent overload protection (refrigeration)

Solution:
1. Check whether the condensing pressure is over high nor not.
2. Problem comes from the damaged outdoor coil temp. sensor if the condensing
pressure is normal, solution is to replace the sensor probe accordingly.
3. Check whether:
a. The condenser is dirty or not
b. Air circulation of condenser is blocked or not
c. Outdoor fan motor is operating normally or not
d. Whole circulation system is blocked or not if the condensing pressure
is over high.
P5-Compressor discharge temp protectionerror lock/F2: 120NExhaust high
temperature protection
Error
phenomenon
Explanation of
error
Tools required
for inspection
Frequent
problematic part
Inspection
procedure and
key points
Special attention
Error code
LED light signal of
external panel
Cause: The exhaust pipe temperature of the compressor appear 3 times
of exhaust protection within 20 minutes, and it will report P5;
Inspection path: Exhaust temperature sensor→Unit pressure→Main
control board
Multimeter, exhaust sensor (50K)
Exhaust gas sensor resistance error, system lack of fluoride, system
blockage
1. Use a multimeter to check the resistance of the exhaust temperature
sensor (50K at 25 degrees);
2. Check the system pressure status and whether the pressure is
abnormal;
3. Replace the main control board.
When measuring the resistance of the exhaust temperature sensor, the
actual resistance is related to the current temperature, which is not
standard 50K.
P5
LED1
LED2
LED3
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