Owner’s Manual for Flameless Air Heater 21
Troubleshooting
Digital Controller Status Messages
Problem Cause Solution
No/low heat condition
Incorrect heater setting (target tempera-
ture too low)
Adjust heater output
Access doors are open Close all access doors
Low HTF/hydraulic oil level
• Check level on tank sight
glass, adjust as needed
• Inspect HTF hoses for leaks
or loose fittings
• Check fluid for foaming
HTF/hydraulic oil filters clogged
Check restriction gauges/replace
HTF filters
Ducting too long for ambient conditions
Move unit closer to heat recipient if
possible
HTF pump drive sheared Contact Generac technical service
Message Cause
Engine Warming – Please Wait Engine coolant temperature < 140°
Engine Preheat Wait approximately ten seconds after heater power up
Engine is not ready – Check RPMs, Fuel Level or
Wait to Start
Engine RPMs < 500
Fuel level < 10%
Wait to Start signal
Low Fuel Warning
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
Check heater settings or connections, then Reset
on the Machine Overview
IFM controller detected a short or break in a sender
Heater is cooling down – Please wait
IFM controller detects heater is in cool down. ON button dis-
abled.
Engine is going to shutdown Fuel level <= 12% for 3 hours and 15 minutes
Engine Fault Shutdown
Low engine oil pressure
High engine coolant temperature
Engine overspeed
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