TROUBLESHOOTING
See Table 8 and Fig. 24 and 25 to assist in troubleshooting the 619E fan coil units.
Table 8 — Troubleshooting
PROBLEM
POTENTIAL SOURCE
ACTION
Unit does not
operate
Circuit breaker has tripped or fuse is blown
Reset the circuit breaker or replace the fuse.
Power failure
Restart fan coil unit operation when power is restored.
Voltage is too low
Confirm the available voltage.
Insufficient Cooling
Air filter is blocked with dust
Clean the air filter.
Temperature is not set properly
Check and reset if necessary.
Window(s) and/or door(s) are open
Close window(s) and door(s).
Outdoor unit is obstructed
Remove the obstruction.
Fan speed is too low
Change the fan speed
Operation mode is set to fan or auto. mode
Change to cooling operation or reset temperature
(using remote controller).
Insufficient Heating*
Air filter is blocked with dust
Clean the air filter.
Temperature is not set properly
Check and reset if necessary.
Window(s) and/or door(s) are open
Close window(s) and door(s).
Outdoor unit is obstructed
Remove the obstruction.
Unit stops during
operation
Off timer is operating
Turn off the off timer function.
Room temperature has reached the programmed
set point
Normal unit operation.
*Heat pump systems only.
LEGEND AND NOTES FOR FIG. 24 AND 25
NOTES FOR FIG. 24 AND 25
1. If any of the original wire furnished must be replaced,
it must be replaced with type 90 C wire or its equivalent.
2. Wire in accordance with National Electrical Code (NEC)
and local codes.
3. The CLO locks out the compressor to prevent short cy-
cling on compressor overloads and safety devices. Be-
fore replacing CLO, check these other devices. A mini-
mum 1 amp turn is required to hold contacts closed.
4. A 24-ft long thermistor wiring cable is provided with the
fan coil unit.
5. Compressor and fan motors are protected by internal ther-
mal overloads.
6. Transformer has an internal 2 amp thermal fuse on the
primary side.
AGING
— For the Burn-In Test
(short terminals)
AS
— Assembly
C
— Contactor
CAP
— Capacitor
CH
— Crankcase Heater
CLO
— Compressor Lockout
CN
— Connector
COMP
— Compressor
CT
— Current Transformer
DFB
— Defrost Board
DFT
— Defrost Thermostat
EQUIP GND — Equipment Ground
FMC
— Fan Motor Capacitor
GND
— Ground
HA
— Home Automation
HPS
— High-Pressure Switch
IDC TH
— Indoor-Coil Thermistor
IDFM
— Indoor Fan Motor
JEM-A
— Japan Electric Manufacturing
Industry Association
LLPS
— Liquid Low Pressure Switch
LPS
— Low-Pressure Switch
OAC TH — Outdoor Coil Thermistor
ODA TH — Outdoor-Air Thermistor
ODC TH — Outdoor-Coil Thermistor
OFM
— Outdoor Fan Motor
OFR
— Outdoor Fan Relay
OL
— Overload
PCB
— Printed Circuit Board
RA TH
— Return Air Thermistor
RC
— Resistor Capacitor
RCV
— Receiver
RVS
— Reversing Valve Solenoid
SC
— Start Capacitor
SR
— Start Relay
STM
— Step Motor
TB
— Terminal Block
TRAN — Transformer
U
— Unloader
Terminal (Marked)
Terminal (Unmarked)
Splice
Terminal Block
Factory Wiring
Field Control Wiring
Field Power Wiring
Accessory or Optional Wiring
—15—
