Error Codes

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-5 AIR TEMP TOO HOT” Faulty relay, PC board, or air probe Turn switch to OFF position, then back to ON; if display shows “E-5”, the heating circuits and temperature probe should be checked; once the unit cools down, the controls should return to normal; if “E-5” persists, have the PC board replaced
“E-6A AIR TEMP SENSOR FAILED OPEN” Faulty air 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 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-12A WATER HEATER SENSOR FAILED OPEN" Faulty water heater probe Turn switch to OFF position, then back to ON; if the display shows “E-12A”, the water heater should be checked and repaired or replaced (the water heater probe is built into the water heater); the controls should return to normal; if “E-12A” persists, have PC board replaced
"E-12B WATER HEATER SENSOR FAILED CLOSED" Faulty water heater probe Turn switch to OFF position, then back to ON; if the display shows “E-12B”, the water heater should be checked and repaired or replaced (the water heater probe is built into the water heater); the controls should return to normal; if “E-12B” persists, have PC board replaced
"E-17 HUMIDITY SENSOR FAILED" Faulty humidity sensor Turn switch to OFF position, then back to ON; if the display shows “E-17”, the humidity sensor should be checked; once the humidity sensor is repaired, or replaced, the controls should return to normal; if “E- 17” persists, have PC board replaced. See SP-4 to turn humidity OFF until service is provided
“E-18 NO WATER, FLOAT SWITCH FAILED” Float switch stuck or faulty; faulty relay (stuck on);water pan needs cleaned; loose or faulty water heater sensor; acorn nuts on water heater cover loose, or water heater insulation missing or damaged Turn switch to OFF position, then back to ON; if the display shows “E-18”, check and clean float switch; clean water pan; have relay and water heater sensor checked and replace if necessary; tighten acorn nuts on water heater cover; make sure insulation is under the water heater cover; if “E-18” 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
"E-46 DATA SAVE FAILED" Memory scrambled Turn switch to OFF position, then back to ON; if the display shows “E-46”, the control should be re-initialized (see Programming Section); if “E-46” persists, have PC board replaced

“E-54A CPU TEMP SENSOR

OPEN”

Faulty PC board

Turn switch to OFF position, then back to ON; if display shows “E-54A”, the control should be re-initialized (see Programming Section); if the error code persists, have PC board replaced

“E-54B CPU TEMP SENSOR

SHORTED”

Faulty PC board

Turn switch to OFF position, then back to ON; if display shows “E-54B”, the control should be re-initialized (see Programming Section); if the error code persists, have PC board replaced
"E-80 VENT STUCK OR BAD SWITCH" Vent on rear of module stuck or faulty vent activation switch Check vent on rear of module for obstructions, or have vent activation switch replaced
“PLEASE DE-LIME needs WATER PAN” Water pan needs cleaned Follow the weekly cleaning procedures; this warning will not shut down the heat or humidity; if “PLEASE DE-LIME WATER PAN” persists, have PC board replaced
"WATER LEVEL LOW, PLEASE ADD WATER" (Manual fill) Water pan low on water or empty Fill water pan, in bottom of unit, to the maximum water fill mark; this warning won’t shut down the heat or humidity

NOTICE -

A humidity error only shuts down the humidity system. If a humidity error occurs, and you want to use the cabinet without humidity, turn the humidity off by following the directions for SP-4, Humidity Setpoint, in Special Programming Section of this manual. Once the setpoint is off, the alarm stops, but the error code shows in display.

(Includes “E-12A”, “E-12B”, “E-17”)