Digital Controller Status Messages - Generac Power Systems MAC 750F Owner's Manual

Problem
No/low heat condition

Digital Controller Status Messages

Message
Engine Warming – Please Wait
Engine Preheat
Engine is not ready – Check RPMs, Fuel Level or
Wait to Start
Low Fuel Warning
Check heater settings or connections, then Reset
on the Machine Overview
Heater is cooling down – Please wait
Engine is going to shutdown
Engine Fault Shutdown
Owner's Manual for Flameless Air Heater
Cause
Incorrect heater setting (target tempera-
ture too low)
Access doors are open
Low HTF/hydraulic oil level
HTF/hydraulic oil filters clogged
Ducting too long for ambient conditions
HTF pump drive sheared
Engine coolant temperature < 140°
Wait approximately ten seconds after heater power up
Engine RPMs < 500
Fuel level < 10%
Wait to Start signal
Fuel level < 20%
•
Fuel level notification appears on screen
Fuel level <= 16%
• Fuel level notification appears on screen
•
Heat/fan load reduced to 50%
Fuel level <= 12%
• Fuel level notification appears on screen
• Open heat circuit and close scroll fan circuit
•
Drop engine to idle
Fuel level <= 8%
• Fuel level notification appears on screen
• Engine shuts down
IFM controller detected a short or break in a sender
IFM controller detects heater is in cool down. ON button dis-
abled.
Fuel level <= 12% for 3 hours and 15 minutes
Low engine oil pressure
High engine coolant temperature
Engine overspeed
Troubleshooting
Solution
Adjust heater output
Close all access doors
• Check level on tank sight
glass, adjust as needed
• Inspect HTF hoses for leaks
or loose fittings
• Check fluid for foaming
Check restriction gauges/replace
HTF filters
Move unit closer to heat recipient if
possible
Contact Generac technical service
Cause
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