Page
16 of 39
Number
SM001-300
HVAC: Idle Management System
ESPAR Heating System Diagnostic
Table
Check service screens before troubleshooting, see
“
Monthly running and periodic maintenance are required
for proper heater operation and performance.
Table 2.
ESPAR Heating System Diagnostic Table
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION / “Appendix” on page 18.
Heater is connected to the
EHVAC unit and will not oper-
ate.
1. Loose connection.
2. No power is avail-
able at the unit.
3. Blown fuse or fuses.
4. Check Voltage path
to unit and control.
5. Defective EHVAC
Control.
6. System controller
defective.
7. Broken wire or
defective wire har-
ness.
8. Check for Fault
code.
1. Confirm all connections are tight, including ground
lugs, and terminals crimped on wires and battery
cables.
2. Check
Aux.
batteries for Voltage. Check for heater
enable signal from EHVAC unit. Heater unit has a low
voltage disconnect of 10.6 volts. See “
Espar Heater Connected to the EHVAC Digital Con-
troller
3. Check 20 amp main fuse and 5 amp control fuse. See
Espar manual.
4. Check harness.
5. Check control. See “
N. Testing the Espar Heater Con-
nected to the EHVAC Digital Controller
and Espar manual.
• Test System Controller.
6. Inspect wiring harness and all ground wires.
7. View faults in the heater controller with Espar’s Edith
PC diagnostics or hand held diagnostics tool. See
Espars guide.
Heater is not connected to the
EHVAC unit and will not oper-
ate.
1. Loose connection.
2. No power is avail-
able at the unit.
3. Blown fuse or fuses.
4. Check Voltage path
to unit and control.
5. Defective Heater
Control.
6. System controller
defective.
7. Broken wire or
defective wire har-
ness.
8. Check for Fault
code.
See Espar Manual.