20
TROUBLESHOOTING PROCEDURE - ERROR CODES
Error Codes
Should one of two temperature sensors become
disconnected or fail, error code will appear in display.
Control will not operate properly until sensor is working.
E1
– Coil Sensor malfunction or disconnected.
Check location
J1
on thermostat board.
E2
– Room Air Sensor malfunction or disconnected.
Check location
J2
on thermostat board.
Q:
Display on indoor unit is blank. What should I do?
A:
Check power supply (see “Power supply check” Section).
If unit still fails to operate via
On/off
button inspect
control box for loose wire. Also inspect circuit boards for
burnt components. If no obvious problem can be found
replace all circuit boards including unit keypad. Do not
attempt to troubleshoot individual circuit boards.
Q:
Display flicker. Is this normal?
A:
Small amount of flickering of display is normal. Room
lighting may make flickering more noticeable at times.
Q:
How long will fan run?
A:
While unit is in cooling or heating and auto fan mode is
selected, fan speed is determined by the microprocessor
and speed adjustment is made according to room and
setpoint temperatures. Fan will switch to
High
speed
when room temperature deviates by more than two
degrees from setpoint. Fan will switch to
Low
speed
if deviation is one degree. When room temperature
reaches setpoint temperature heat/cool call is dropped.
Fan will stay on for additional 60 sec. to purge unit of
any residual energy. If
High
or
Low
is selected fan will
operate continuously regardless of set point or room
temperatures.
Q:
What causes my indoor unit to freeze-up?
A:
Evaporator freeze up is usually symptom of another
problem. Units with infrared compatible, unit mounted
controls are equipped with freeze protection to prevent
freeze up from occurring. If freeze up does occur check
the following.
• Check freeze sensor is located in lowest part of coil.
Generally this is where freeze up will begin.
• Check freeze sensor is inserted fully and snuggly in coil
fin. If not, another location may need to be selected. Be
careful not to insert sensor directly into coil tube rather
insert sensor between two tubes.
• Check indoor air filter. It should be clean and free of
dirt. Dirty filter reduces airflow and efficiency. Verify coil
is clean. If coil is dirty then it should be cleaned using
an appropriate coil cleaner or mild detergent.
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