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| Display | Cause | Solution |
|---|---|---|
|
“E-4 CPU TOO HOT” |
Control board too hot; unit overheating or louvers clogged |
Turn switch to OFF position, then back to ON; if display still shows “E-4”, the PC board is getting too hot; clean louvers and check cooling fan; if cooling fan is not working, have it replaced; once panel cools down, the controls should return to normal; if “E-4” persists, have the PC board replaced |
| "E-6B AIR TEMP SENSOR FAILED SHORTED" | Faulty air temperature probe | Turn switch to OFF position, then back to ON; if the display shows “E-6”, the temperature probe should be checked; once the temperature probe is repaired, or replaced, the controls should return to normal; if “E-6”persists, have PC board replaced |
| "E-41 SYSTEM DATA LOST" | Memory scrambled | Turn switch to OFF position, then back to ON; if the display shows “E-41”, the control should be re-initialized (see Programming Section); if “E-41” persists, have PC board replaced |
Controls set CE=y means unit does not have a temperature probe and the controls must be set to CE=n in Special Programming.
