D7W TS.pdf - Espar

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D. 7 Day Timer Troubleshooting
The 7 day timer (Figure IV C) has a fault code
retrieval device built into the unit. This function
automatically activates if the heater is experiencing
problems.
- Fault codes appear on the LCD display screen.
- These codes can then be translated from the
charts on the previous pages.
Figure IV C
E. Circuit Tester Troubleshooting
The purpose of this tester is to help a service
technician troubleshoot problems faster and more
accurately. It tests individual electrical components,
checks the continuity of each circuit and
runs the heater manually.
Note: To use this tester (P/N CA1 05 010) with
the D7W 25 1807 you will require an
adapter-P/N CA1 05 023
1. Initial Set Up
- All switches should be in the “Off” position.
- Plug in the connectors from the tester to the
corresponding ones on the heater harness.
- Ensure proper power, fuel and coolant
connections.
2. Operating Instructions
- Switch the power switch to the “On” position and
the voltmeter will indicate the voltage across
the control unit. The voltage must be between
10.0V and 14.0V, on a 12V system or between
20V and 28V on a 24V system.
- Set the heater switch or timer to run position.
- The red “Switch On” LED should illuminate.
- Test individual components by switching each of
the nine switches on the right side of the tester
to “CHECK” position.
- The ohmmeter will indicate the resistance value
of each component as high or low.
- Compare measured value to componen
resistance chart in Table 1.
- If any mismatch is indicated the component
should be replaced.
- Do not measure more than one component at a
time.
Figures IV D