Henny Penny HHC-990 User Manual

SECTION 5. TROUBLESHOOTING

5-1. TROUBLESHOOTING GUIDE

PROBLEM CAUSE CORRECTION

Product not • Doors left open • Keep doors closed except
holding temperature to load and serve product

• Product held too long • Hold product only for recom­mended times

• Control temperature set too low • Increase air temperature
(SP-3) in Special Program Mode

• Door gasket torn or worn • Replace bad door gaskets

Model HHC-990

Cabinet steaming • Humidity setpoint too high • Decrease humidity setpoint
product soggy (SP-4) in Special Program Mode

Product dry • Humidity setpoint too low • Increase humidity setpoint

(SP-4) in Special Program Mode

• No water in pan • Pour water in water pan

Unit not heating • Blown fuse • Change15 amp fuse

Unit not reaching set • Doors left open • Keep doors closed except
temperature to load and serve product

• Door gasket torn or worn • Replace bad door gaskets

More detailed troubleshooting information is available in the T echnical Manual, available at www .hennypenny .com,

or 1-800-417-8405 or 1-937-456-8405.

5-1 703

Model HHC-990

5-2. ERROR CODES AND The display shows the following error codes and warnings when a
WARNINGS fault is detected, along with an alarm sound. Both the heat and

humidity systems shut down, except when specified otherwise.

Display Cause Panel Board Correction

“E-4 CPU TOO HOT” • Control board too hot;

unit overheating or
louvers clogged

“E-5 AIR TEMP TOO HOT” • Faulty relay, PC board,

or air probe

“E-54A CPU TEMP SENSOR • Faulty PC board

OPEN”

• 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

• 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

• 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 • Faulty PC board

SHOR TED”

• 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-6A AIR TEMP SENSOR • Faulty air probe

F AILED OPEN”

• 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

303 4-7

5-2. ERROR CODES AND

WARNINGS (Continued)

Display Cause Panel Board Correction

“E-6B AIR TEMP SENSOR • Faulty air temperature

FAILED SHORTED” probe

Model HHC-990

• 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 WA TER HEATER • Faulty water

SENSOR FAILED heater probe
OPEN”

“E-12B WATER HEATER • Faulty water

SENSOR FAILED heater probe
CLOSED”

“E-17 HUMIDITY SENSOR • Faulty humidity sensor

FAILED”

• 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

• 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

• 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

“E-18 NO WATER, FLOAT • Float switch stuck or

SWITCH F AILED” 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

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” and “E-18”).

4-8 107

• 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

5-2. ERROR CODES AND
WARNINGS (Continued)

Display Cause Panel Board Correction

Model HHC-990

“E-41 SYSTEM DA T A LOST” • Memory scrambled

“E-46 DA T A SA VE F AILED” • Memory scrambled

“E-80 VENT STUCK OR • V ent on rear of module
BAD SWITCH” stuck or faulty vent

activation switch

“PLEASE DE-LIME • W ater pan needs
W ATER P AN” cleaned

• 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

• 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

• Check vent on rear of module for obstruc­tions, or have vent activation switch
replaced

• Follow the weekly cleaning procedures;
this warning will not shut down the heat
or humidity; if “PLEASE DE-LIME
W ATER P AN” persists, have PC board
replaced

“W ATER LEVEL LOW, PLEASE” • W ater 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

303 4-8