10 Heater Current Too High (Check Alarm)

Thermo King Alarm Code

Description	Corrective Action
Heater Current Too High (Check Alarm) Occurs during Pretrip (PTI) or Function Test. Heater power consumption is 25% above expected current draw (above approximately 4.4 amps and 5.1 amps, depending on voltage). Indicates: Incorrect heaters or heater connections Defective volt or amp meter on relay board Defective heater element	Enter Manual Function Test and turn heaters ON. Check current draw on each phase. Current draw should be about 4.4 amps on each phase at 400V (5.1 amps at 460V). Check heater resistance between H1 and H2, H2 and H3, and H1 and H3. Resistance should be about 99 ohms on each leg.