Alarm code 52 on Thermo King SBIII SR+

Hello, Could some one please help me with Alarm code 52 on Thermo King SBIII SR+.
I searched for it but could not find it.

Thanks

http://www.vtatehnika.ee/public/file...m_Codes_EN.pdf

alarm code list

52 is heat circuit

Heat Circuit
Indicates that a problem exists with
the heat circuit. The Heat LED and
fuse are located on the Relay Board.
The wiring is located in the Main
Harness via the 26P and 26G circuit
and the Interconnect Harness via the
14P circuit.
This is a check alarm.
1. Check the refrigeration/heating performance of the unit with
a Unit Self Check. Repair refrigeration system as required.
2. Using Service Test Mode as shown in Service Procedure
A34A, check unit performance in heat modes. Repair
refrigeration system as required.
3. Check fuses F6 and F35 on the relay board.
4. Check the Return Air and Discharge Air sensors for proper
calibration.
5. Check pin 9 on the 37 pin Amp connector at the
microprocessor for a pushed pin.
6. Check the harness wire 14P with an ohmmeter for
continuity per Service Procedure H04A.
7. Check the 26P and 26G wires with an ohmmeter per
Service Procedure H04A.

Will do. Thank you very much.
sgolsen7

hi guys.i have an sltci with alarm -36.even in the Sguarded access it doesnt come off.
you think its the micro?

Electric motor failed to run. No standby power or a phase down. Try checking the voltage at the phase detector (battery voltage on cables ER and 8) Check the motor contactor. You could also try testing the alternator. This code is usually tripped by the alternator frequency being less than 200Hz for 10 seconds