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Cause
HEATER
SENSOR
FAILED
OPEN"
"E-12B"
"WATER
HEATER
SENSOR
FAILED
CLOSED"
"E-17" "HU-
Faulty humidity
MIDITY
sensor.
SENSOR
FAILED"
"E-18" "NO
Float switch stuck
WATER,
or faulty;
FLOAT
Water pan needs
SWITCH
cleaned.
FAILED"
Loose or faulty
water heater sen-
sor; faulty relay
(stuck on).
Acorn nuts on
water heater cov-
er loose.
Water heater in-
sulation missing
or damaged.
"E-41"
Memory
"SYSTEM
scrambled.
DATA
LOST"
"E-46" "DA-
TA SAVE
FAILED"
"E-54A"
Faulty PC board.
"CPU
TEMP
SENSOR
OPEN"
Panel Board Correction
replaced (the water heater probe is built into the water
heater); the controls should return to normal; if error code
persists, have PC board replaced.
Turn unit off, then back on; if display shows "E-17", the hu-
midity sensor should be checked; once the humidity sen-
sor is repaired, or replaced, the controls should return to
normal; if error code persists, have PC board replaced.
Turn unit off, then back on; if display shows "E-18", check
and clean float switch.
Clean water pan.
Have relay and water heater sensor checked and re-
placed if necessary.
Tighten acorn nuts on water heater cover.
Make sure the insulation is under the water heater cover;
if error code persists, have PC board replaced.
Turn unit off, then back on; if display shows "E-(41 or 46)",
the control should be re-initialized (see
gramming , page
19); if error code persists, have PC board
replaced.
Turn unit off, then back on; if display shows "E-54(A or
B)", the control should be re-initialized (see
gramming , page
19); if the error code persists, have PC
board replaced.
Chapter 4 Pro-
Chapter 4 Pro-
27
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