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
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