ENVIROMASTER INTERNATIONAL LLC
14
TRANSMITTER FAILURE (MICRO UNITS ONLY).
Try new
batteries first, if receiver bleeps on transmitting signal, trans-
mitter is OK. If no response press On/Off button on unit
fascia. If the unit responds to the On/Off button transmitter
is faulty.
MICROPROCESSOR FAILURE (MICRO UNITS ONLY).
The
microprocessor is the least likely component to be at fault.
Investigate all other possibilities in every section of this
troubleshooting guide first. Replace the micro only after all
other avenues of investigation are exhausted.
WATER LEAKING FROM UNIT
(See “Condensate High Level.”)
POSSIBLE CAUSES/REMEDIES
CONDENSATE PLUG LOOSE OR MISSING.
Check that
the rubber condensate plug is securely fitted to the under-
side of the unit’s polystyrene drip tray. On some models this
is located underneath the fascia support rails on the pump
side of the unit.
UNIT INSTALLED UNEVENLY.
With fascia removed, ensure
that the unit chassis is level (at the face) both front to back
and left to right, to ensure correct condensate flow.
CONDENSATE DRAIN PIPING INSTALLED INCORRECTLY.
Check that the site installed condensate gravity drain slopes
‘downhill’ away from the unit (See installation section of this
manual for more information.)
BLOCKED/KINKED CONDENSATE PIPE.
Check conden-
sate pipework for blocks/kinks and clear as necessary. Check
for a water tight connection between the PVC condensate
outlet and the site installed condensate gravity drain.
CONDENSATE PUMP BLOCKED OR FAILED.
Clear any
blockages and ensure that power is being applied to the
pump. If the pump still does not run, replace the pump.
FLOAT SWITCH FAILURE.
Check that the float switch op-
erates correctly and is properly positioned. Float switch is
normally closed, opens on rise of water level.
CONDENSATE HIGH LEVEL
(Red alarm LED on Micro Unit
will flash at one second intervals.
)
POSSIBLE CAUSES/REMEDIES
MAXIMUM PUMP LIFT EXCEEDED.
Check that the con-
densate pump head is no greater than 18” (See installation
section of this manual for more information).
BLOCKED/KINKED CONDENSATE PIPE.
See section “Wa-
ter Leaking From Unit.”
TROUBLESHOOTING SECTION
RED ALARM LED FLASHING AT 1 SECOND
INTERVALS
(Microprocessor units only
)
POSSIBLE CAUSES/REMEDIES
FAULTY FLOAT SWITCH.
See section “Condensate High
Level.”
FAN TRIP.
See section “Fans Will Not Run.”
INDOOR COIL SENSOR FAILURE (CONNECTED TO MI-
CRO TERMINAL ‘T3’).
After checking the above, use the
unit wiring schematic to isolate the indoor coil sensor and
measure the resistance. Sensor is 50K@72°F type. Check
and replace if necessary.
RED ALARM LED FLASHING AT 5 SECOND
INTERVALS
(Microprocessor units only)
POSSIBLE CAUSES/REMEDIES
RETURN AIR SENSOR FAILURE (CONNECTED TO MICRO
TERMINAL ‘T1’).
Use the unit wiring schematic to isolate
the return air sensor and measure the resistance. Sensor is
50K@72°F type. Check and replace if necessary.
UNIT WILL NOT OPERATE
POSSIBLE CAUSES/REMEDIES
NO POWER (MAIN POWER).
Check power supply to the
unit. For micro units, check power to the micro and check
the on board micro fuse.
NO 24V CONTROL CIRCUIT POWER.
For DX and chilled
water systems, first check that the condensing unit is
switched on, then check the 24V feed from the control trans-
former. If not present, check transformer windings – replace
if necessary.
CONTROL CIRCUIT DISABLED BY UNIT PROTECTION
DEVICE.
In some models, particularly electro-mechanical
units, some protection devices (such as freeze-stats, fan
trips, etc) are wired in line with the 24V control circuit feed to
cause the unit to shut down in an alarm condition. Use the
unit’s wiring schematic to identify these devices and investi-
gate accordingly.
INFRARED RECEIVER FAILURE (MICRO UNITS ONLY).
If
audible bleep is heard on signal transmission from transmit-
ter and the green LED is lit or flashing, receiver is OK. If
there are no LEDs lit and the unit will not respond to the
transmitter, press the On/Off button on the fascia display
panel. If the unit responds to the On/Off button receiver is
OK. Check transmitter.
