33
TROUBLESHOOTING CHART
Co m p lain t
Sys te m
Op e r atin g
Pr e s s ur e s
P OS SIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"P OS SIBLE CAUSE"
SYMPTO
M
Syste
m
will n
o
t sta
rt
Co
m
p
re
sso
r will n
o
t sta
rt -
fa
n
r
u
n
s
Com
p
. and Cond. F
an will
not star
t
E
v
apor
ator
fan
will not star
t
Condenser
fan w
ill not star
t
Com
p
ressor runs - goes off on overl
oad
Com
p
re
ssor
cycles on over
load
S
ystem
runs conti
nuousl
y
- l
it
tl
e cool
ing/htg
T
oo cool
and then too warm
Not cool
enough on warm
days
Certai
n areas too cool
, others too warm
Com
p
re
ssor
is noisy
S
ystem
runs - bl
ows col
d
ai
r i
n
heati
n
g
Un
it will n
o
t te
rm
in
a
te
d
e
fr
o
st
Un
it will n
o
t d
e
fr
o
st
Low sucti
on pressure
Low head pressure
Hi
gh sucti
on pressure
Hi
gh head pressure
Te st Me thod
Re m e dy
S
ee S
e
rvi
ce P
rocedure R
e
f.
Pow er Failure
•
Test V oltage
S-1
Blow n Fus e
•
• •
Ins pec t Fuse Siz e & Ty pe
S-1
Unbalanced Pow er, 3PH
•
• •
Test V oltage
S-1
Loose Connec tion
•
•
•
Ins pec t Connec tion - Tighten
S-2, S-3
Shorted or Broken Wires
• • • • • •
Test Circ uits With Ohmmeter
S-2, S-3
Open Fan Ov erload
• •
Test Continuity of Ov erload
S-17A
Faulty Thermos tat
•
• •
•
Test Continuity of Thermos tat & Wiring
S-3
Faulty Transf ormer
•
•
Chec k Control Circuit w ith V oltmeter
S-4
Shorted or Open Capacitor
•
• • • •
Test Capacitor
S-15
Internal Compres s or Overload Open
•
♦
Test Continuity of Ov erload
S-17A
Shorted or Grounded Compress or
•
•
Test Motor Windings
S-17B
Compress or Stuc k
•
• •
♦
Us e Test Cord
S-17D
Faulty Compress or Contactor
•
• •
Test Continuity of Coil & Contac ts
S-7, S-8
Faulty Fan Relay
•
Test Continuity of Coil A nd Contac ts
S-7
Open Control Circ uit
•
Test Control Circ uit w ith V oltmeter
S-4
Low V oltage
•
• •
Test V oltage
S-1
Faulty Evap. Fan Motor
•
•
♦
Repair or Replac e
S-16
Shorted or Grounded Fan Motor
•
•
Test Motor Windings
S-16
Improper Cooling A ntic ipator
•
•
Chec k Resis tanc e of A ntic ipator
S-3B
Shortage of Ref rigerant
• •
♦
• •
Test For Leaks, A dd Ref rigerant
S-101,103
Res tric ted Liquid Line
• •
• •
•
Remov e Res tric tion, Replac e Restricted Part
S-112
Open Element or Limit on Elec . Heater
♦
♦
Test Heater Element and Controls
S-26,S-27
Dirty A ir Filter
•
• •
•
♦
Ins pec t Filter-Clean or Replace
Dirty Indoor Coil
•
• •
•
♦
Ins pec t Coil - Clean
Not enough air ac ros s Indoor Coil
•
• •
•
♦
Chec k Blow er Speed, Duc t Static Pres s, Filter
S-200
Too much air across Indoor Coil
♦
•
Reduc e Blow er Speed
S-200
Ov erc harge of Ref rigerant
• •
•
♦
• •
Recov er Part of Charge
S-113
Dirty Outdoor Coil
• •
•
♦
•
Ins pec t Coil - Clean
Noncondensibles
•
•
♦
•
Recov er Charge, Ev ac uate, Recharge
S-114
Rec irc ulation of Condens ing A ir
•
•
•
Remov e Obs truc tion to A ir Flow
Inf iltration of Outdoor A ir
•
• •
Chec k Window s , Doors , V ent Fans , Etc.
Improperly Loc ated Thermos tat
•
•
Reloc ate Thermostat
A ir Flow Unbalanc ed
•
•
Readjust A ir V olume Dampers
Sy s tem Unders iz ed
•
•
Ref igure Cooling Load
Broken Internal Parts
•
♦
Replac e Compres sor
S-115
Broken V alves
•
•
• •
Test Compres sor Ef f icienc y
S-104
Inef f ic ient Compress or
•
♦
• •
Test Compres sor Ef f icienc y
S-104
Wrong Ty pe Ex pans ion V alv e
• • •
•
• •
♦
Replac e V alv e
S-110
Ex pans ion Dev ice Res tric ted
• • •
•
• •
•
Remov e Res tric tion or Replace Ex pans ion Devic e
S-110
Ov ers iz ed Ex pans ion V alve
•
•
Replac e V alv e
Unders ized Ex pansion V alv e
• • •
•
•
Replac e V alv e
Ex pans ion V alve Bulb Loos e
•
•
Tighten Bulb Brac ket
S-105
Inoperativ e Ex pansion V alve
•
•
•
Chec k V alve Operation
S-110
Loose Hold-dow n Bolts
•
Tighten Bolts
Faulty Rev ers ing V alv e
•
♦ ♦ ♦
♦ ♦ ♦
Replac e V alv e or Solenoid
S-21, 122
Faulty Def ros t Control
•
♦ ♦ ♦ ♦ ♦
♦
Test Control
S-24
Faulty Def ros t Thermostat
♦ ♦ ♦ ♦ ♦ ♦ ♦
Test Def rost Thermostat
S-25
Flow rator Not Seating Properly
•
• •
Chec k Flow rator & Seat or Replac e Flow rator
S-111
•
Co olin g o r He ating Cycle (He at Pu m p )
♦
C OOLIN G/H P AN ALYS IS C H AR T
No Co oling
Un s atis facto r y
Coo lin g /He ating
He atin g Cycle Only (He at Pu m p )
