4
FAULT CODE / TROUBLESHOOTING
14
025 - DIAGNOSTICS CABLE BLUE/WHITE - SHORT CIRCUIT
1. Refer to “No Communication”
031 - BLOWER MOTOR INTERRUPTED
1. Visually inspect air inlet for scratches on impeller. If the fan has visable rub marks, locate cause and correct, thisis not a warrantable failure)
2. Run unit and listen for rubbing.
3. Turn blower by hand checking for hard spots.
4. If any rubbing, scratches, or binding is found resolve the issue:
a. Possible causes:
i. Physical obstruction
ii. Ducting clamp over-torqued
iii. Floor mat or debris under heater when mounted
5. If a hard spot is noted and no intake issue are found remove blower motor and inspect the combustion fan and replace the whole assemble if necessary.
a. A warped combustion fan is caused by short cycling and a power interruption while running.
032 - BLOWER MOTOR SHORT CIRCUIT
1. Install test ECU
2. Clear codes and run unit.
3. If problem is resolved leave new control unit in the Espar.
4. If problem is not resolved replace blower, reinstall the previos control unit and restart the troubleshooting.
033 - Blower motor speed failure.
1. Motor speed varies from specication by more than 10% for longer than 30 seconds.
2. Inspect the control unit ensuring it is secure.
3. Fan speed is measured from a small magnet located on the fan wheel and the ECU itself.
4. A loose ECU will cause inaccurate readings.
5. If the ECU is loose, tighten the screw.
6. If the screw is stripped install a larger screw.
7. Clear codes and run unit.
8. If code persists continue below otherwise clear historic codes and complete the job.
9. Check heating air intake for obstructions ensuring the blower turns freely.
10. See steps for Code 31
11. Clear codes and run unit.
12. If problem persists install test control unit.
13. Clear codes and run unit.
14. If problem is resolved leave new control unit in the Espar.
15. If problem is not resolved replace blower, reinstall the previos control unit and restart the troubleshooting.
034 - Blower motor outlet (+) short circuit after B+ (battery voltage).
1. Inspecting wiring from blower motor to control unit.
2. If damaged replace blower otherwise continue below
3. Install test control unit.
4. Clear codes and run unit.
5. If problem is resolved leave new control unit in the Espar.
6. If problem is not resolved replace blower, reinstall the previos control unit and restart the troubleshooting.
047 - SHORT CIRCUIT OR OVERLOAD - FUEL METERING PUMP (FMP)
1. Fuel pump positive wire (green w/red) is shorted to chassis ground.
2. Inspect wiring for damage, check continuity from 16 pin to fuel pump plug and repair using a heat shrink solder butt connector as needed.
If not damaged continue below.
3. Unplug the fuel pump and power up unit.
4. If fault Code 48 is displayed fuel pump is defective.
5. If fault Code 48 is not displayed recheck wiring.
6. If still not resolved install test ECU.
7. If problem is resolved leave test unit in, clear codes and run unit.
REVISION LEVEL A - 09/09/15
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