2-Ton Electrical Troubleshooting Chart - Cooling - Friedrich H)A09K25L Service Manual

eLeCTRICAL TROUBLeshOOTINg ChART - COOLINg
Compressor and outdoor
fan motor run but indoor
blower does not run
Yes
24V at t-stat and 24V at t-stat and
control wiring? control wiring?
Yes Yes
Yes
Is Line Voltage present
at Motor Leads?
Yes
Check Capacitor, is
Capacitor Good?
Yes
Motor should run
32
NO COOLING OPERATION
Indoor blower runs but
outdoor fan motor and
No
compressor do not run
Yes
Defective t-stat
defective control wiring
No No
or transformer
Problems indicated
in Blower Relay
No
of board
Replace Capacitor
No
Possible motor
problem indicated.
Check motor
No
thoroughly
24k BTU
Before continuing
Insure that Fuses
are good and/or that
electronics control
Circuit Breakers are
on and voltage is 208/230
test mode, page 15
O.K.
Set thermostat to
"Cool," move the Temp.
lever below the present
Room Temp.
No
O.K.
Line voltage present
Compressor outdoor
fan motor and indoor
blower should now
operate
Yes
"R" Terminal on board
See Refrigerant Circuit
diagnosis if unit still is
not cooling properly
208/230 Volts present
at #1 relay and "OD"
208/230 Volts present
Supply Circuit
problems, loose
Connections, or bad
Relays/Board No
Replace Capacitor
and/or Start Assist
Device
No
Allow ample time
for pressures to
equalize No
Possible Compressor
problem indicated.
See Compressor
No
Checks
check for Error
Codes, see
diagnostics and
Nothing operates,
entire system
appears dead
Yes
Check Supply Circuit's
jumper at transformer. If
at the Transformer
Primary
No
Yes
Problems indicated with
24 Volts at
No
Yes Yes
24 Volts present at
Problems indicated with
Y terminals on
No
t-stat and board?
Yes
Yes
terminal on board? No
Yes
at compressor's
contactor? No
Yes
No
Is Locked Rotor
Voltage a minimum of
197 Volts?
Yes
Are Capacitor and (if
so equipped) Start
Assist good?
Yes
Have System
Pressures Equalized?
Yes
Compressor should
run
okay, replace board
Control Transformer
replace board
Room Thermostat or
Control Wiring
Replace board
Check contactor
If defective replace
Compressor and
outdoor fan motor
should now operate
Yes
See Refrigerant
Circuit Diagnosis
if unit still is not
cooling properly