High Coolant Temperature
engine
Description
High coolant temperature means coolant is above the listed temperature limits for the ambient condition, and the unit shuts down and alarms.
Activation Conditions
Condition 1: Ambient temperature is below 120°F (48.9°C) and engine coolant temperature is above 230°F (110°C). Condition 2: Ambient temperature is above 120°F (48.9°C) and engine coolant temperature is above 241°F (116°C). Condition 3: Ambient temperature is at or above 120°F (48.9°C) and the engine coolant temperature has remained between 230 and 241°F (110 and 116°C) for more than five minutes.
Unit Behavior
Shutdown and alarm.
Reset Conditions
Auto reset after 15 minutes if engine coolant temperature falls below 212°F (100°C), or alarm may be manually reset using the display mounted keys or by turning the unit off and back on again.
Corrective Actions
1. Check Coolant Level WARNING ! Do not remove the cap from a hot coolant system. If the cap must be removed, do so very slowly in order to release the pressure without spray. a. Check coolant level in overflow bottle. Level must be in the normal range. b. Inspect connecting tube between overflow bottle and radiator. Connections must be airtight. No leakage or holes in tube. 2. Check Freeze Point Of Coolant: Use Coolant Tester to check concentration of anti-freeze mixture. Must be between 40% to 60% Ethylene Glycol to water mixture. 3. Check Airflow Through Radiator and Condenser Coil a. Inspect condenser and radiator. Ninety percent or more of the coil surface must be undamaged. Condenser/Radiator coil must be clean. b. Check airflow (with unit running). Verify even airflow through the entire coil and no “dead” spots. c. Check upper and lower fan belt tension and condition. Verify no glazing, cracking, or slipping. Replace if required. Refer to Section 1.6. 4. Check Water Pump/Alternator Belt Tension and Condition: Verify no glazing, cracking, or slipping. Refer to Figure 1.15. Replace if required. Alarm continued on next page...