40
TROUBLESHOOTING GUIDE
Faults displayed on screen
Display Unit Type Description Possible Causes Solutions
FLOAT SW FAULT ESP/WCSP
The primary drain pan float
switch has faulted. A Y call to
the outdoor unit will not be al-
lowed. Hard lockout, requires
a power cycle to reset.
Clogged drain causing
float switch to trip
Identify location of clog and clear clog
Broken float switch Inspect for damage. Replace as needed
Wiring disconnected at
control board or switch
Use ohm meter to test leads. Manually lift float.
If ohm meter is "open" then check wiring or
break in wire. Replace/repair as needed.
ANTIFROST FAULT ESP/WCSP
The anti-frost sensor (located
on primary coil) has gone
below the "AFST" set point
(see flow chart above for set-
ting). This can be seen as
"Coil 1 Temp" in the display
screen.
Low-Refrigerant Charge
Ensure proper subcooling and charger per out-
door unit manufacturers recommendations
Refrigerant leak in system. Inspect all refriger-
ants components to identify is a leak is present.
Repair/replace as needed.
Low airflow
Check return air filter. If dirty,clean/replace filter
Check for restrictions in ductwork
Check for proper airflow to the space by meas-
uring delivered CFM/outlet. CFM/outlet in
space should be between 30-40 CFM/Outlet.
Increase airflow by navigating through menus
(see above) and adjusting airflow for the proper
input (Y1, Y2, G etc…)
Sensor is reading
incorrectly
Unplug sensor from control board. Read resist-
ance across sensor and use resistance chart
(below) to compare against a known tempera-
ture. If temperature is reading incorrectly and
does not match chart, replace sensor.
LOW PRESS FAULT ESP/WCSP
The pressure transducer is
registering less than 0.1"
when the fan is running
Hose is pinched or
clogged
Verify hose and pressure tap on blower is clear.
If hose is pinched, unpinch or replace. If
hose/tap is clogged, unclog or replace.
Pressure transducer has
failed
Remove hose from blower port. Technician can
blow into hose end that is connected to the
blower and verify if display on board registers a
pressure. If no pressure, replace board.
TRANSDUCER
FAULT
ESP/WCSP
The pressure transducer
has failed
Damage
Inspect transducer for damage. Replace con-
trol board
OPEN COIL 1 ESP/WCSP
The coil 1 temperature sensor
is open
Damage
Inspect wiring and sensor to determine if coil
one sensor has been damaged. If damaged,
replace sensor
Loose wire
The coil 1 sensor should be secured tightly to the
terminals on the control board. Is loose, retighten.
SHORTED COIL 1 ESP/WCSP
The coil 1 temperature sensor
is shorted
Damage
Inspect wiring for knicks or cuts that could be
causing a short
OPEN COIL 2 ESP/WCSP
The coil 2 temperature sensor
is open
Damage
Inspect wiring and sensor to determine if coil
one sensor has been damaged. If damaged,
replace sensor
Loose wire
The coil 2 sensor should be secured tightly to the
terminals on the control board. Is loose, retighten.
SHORTED COIL 2 ESP/WCSP
The coil 2 temperature sensor
is shorted
Damage
Inspect wiring for knicks or cuts that could be
causing a short
OPEN LAT ESP/WCSP
The leaving air temperature
sensor is open
Damage
Inspect wiring and sensor to determine if coil
one sensor has been damaged. If damaged,
replace sensor
Loose wire
The coil 1 sensor should be secured tightly to
the terminals on the control board. Is loose,
retighten.
SHORTED LAT ESP/WCSP
The LAT temperature sensor
is shorted
Damage
Inspect wiring for knicks or cuts that could be
causing a short
COIL 1 NOT FOUND ESP/WCSP
If the board does not recog-
nize a signal from the "coil 1"
terminals. The unit will auto-
matically then default and run
the fan after the "fan on delay"
timer has expired.
Disconnected sensor Re-connect sensor
No sensor Add sensor
COIL 2 NOT FOUND ESP/WCSP
If the board does not recog-
nize a signal from the "coil 2"
terminals. The unit will auto-
matically then default and run
the fan after the "fan on delay"
timer has expired.
Disconnected sensor Re-connect sensor
No sensor Add sensor
HWC DISABLE ESP/WCSP
The coil 2 sensor is recog-
nized and connected, but the
SEC HW COIL is disabled
Incorrect programming
If a secondary hot water coil is installed, navi-
gate through the menu tree to enable the "SEC
HW COIL" function/feature.
Sensor place in wrong
location
A sensor is wired into the "coil 2" location incorrectly.
Remove sensor and relocate to proper location.
Defrost ESP/WCSP
The air handler has received
a signal from the outdoor unit
that the outdoor unit has gone
into defrost
Outdoor unit has sent a
defrost signal
If outdoor unit has sent a defrost signal, then
normal operation. If outdoor unit has not sent a
defrost signal, inspect for shorted wires from air
handler to outdoor unit. Replace board if no
short and unit is not sending a signal.
To Next Page
Loading...