What to do if Graco Industrial Equipment primary heater(s) does not heat?
- EEric HowellSep 7, 2025
If the primary heater(s) do not heat, check the following: * Heat turned off: Press the A or B zone keys to turn the heat on. * Temperature control alarm: Check the temperature display for a diagnostic code. * Thermocouple signal failure: Check for a disconnected Fluid Temperature Sensor (FTS) or thermocouple.












