50
Possible Cause (Suggested Fix)
Blower motor will not
operate
• Failed run capacitor on (-)H1P (replace)
• Failed motor (replace)
• Failed motor control module on (-)H1T (replace module)
• Blown 3A fuse on blower control (check for control
circuit short, replace fuse)
• Loose wiring connection or broken wire (check
connections & wiring)
• Failed transformer (replace)
• Failed blower control (replace)
• Disconnect breaker is turned off or has tripped due to
overcurrent or shorted circuit (check for shorts, reset
breaker)
• Blower wheel out of balance (replace or clean blower
wheel)
Water overflowing drainpan
• Plugged drain (clear drain)
• Unit not level (level unit)
Electric heater not heating
properly or not heating at all,
but blower motor is operating
• Over temperature limit has tripped (check for low air-
flow)
• Over temperature limit has failed (replace)
• Sequencer or contactor has failed (replace)
• One or more heating elements have burned out (replace)
• System low on refrigerant charge (check for leaks &
adjust charge)
• Dirty return air filter (replace filter)
• Inadequate air-flow due to incorrect blower motor speed
selected (select higher speed) or excessively restrictive
duct system (correct duct system)
• Incorrect blower motor speed selected (select lower
speed)
• Excessive air-flow (select lower blower motor speed)
• Contaminants on coil fins (clean coil)
• Damaged coil fins (comb out fins or replace coil)
TXV not controlling
properly
• TXV bulb not positioned correctly or clamp not tight
(Check position of TXV sensing bulb and tightness of
clamp)
• Failed TXV (replace)
• Plugged TXV inlet screen (clean or replace screen or
replace TXV)
8.0 DIAGNOSTICS
7.8 REPLACEMENT PARTS
A
ny replacement part used to replace parts originally supplied on equipment must be
t
he same as or an approved alternate to the original part supplied. The manufacturer will
n
ot be responsible for replacement parts not designed to physically fit or operate within
t
he design parameters the original parts were selected for.
T
hese parts include but are not limited to: Circuit breakers, heater controls, heater limit
c
ontrols, heater elements, motor, motor capacitor, blower control, control transformer,
b
lower wheel, indoor coil and sheet metal parts.
W
hen ordering replacement parts, it is necessary to order by part number and include
w
ith the order the complete model number and serial number from the unit data plate.
(
See Parts List for unit component part numbers).
To Next Page
Loading...
Need help?
General
