Carrier Infinity 48DT Series Installation Instructions Manual page 35

SYMPTOM
Head praseura too Low
Exaeaeive euation praaaura
Suction praaaura too Low
IFM does not run
IFM operation is intermittent
IFM Indoor Fan Motor
Table 10 Troubleshooting Chart-Heat Pump Operation (Cont'd)
CAUSE
Low refrigerant charge
Restriction in liquid tube
(Cool) High Heat load
Reversing valve hung up or Making internally
Refrigerant overcharged
(Cool) Dirty air filter
Low refrigerant charge
Metering devbe or low side restricted
(Cool) Insufficient call akflow
(Cool) Temperature too low in con@tioned area
(CAM) Outdoor ambient below 55"F
Filter drier restricted
Blower wheel not secured to shaft
InsufficMnt v@ts.ge at motor
Power connectors not properly sealed
Water dripping into motor
Connectors not firmly seaMd
REMEDY
Check for leaks, repair and recharge
Remove restriction
Check for source and MimMate
Replace valve
Recover excess refrigerant
Replace filter
Check for leaks, repair and recharge
Remove source of restriction
Increase air quantity
Check filte_replace Jfnecessary
Reset UI setting
Verify low-ambient cooling enabbd in U!
Replace
Properly tighten blower wheM to shaft
Determine cause and correct
Connectors should snap easily; do not force
Verify proper ddp loops in connector wires
Gently pull wires individually to be sure they are
crimped into the housing
Table 10 T_-oubleshnnting Cha_l-Gas Furnace Operation
SYMPTOM
Burners will not ignite
Lnadequate heating
Poor flame characteristics
CAUSE
Water in gas line
No power to unit
No 24-v power suppmy to contr@ circuit
Mis-wired or loose connections
Misaligned spark electrodes
No gas at main burners
Inducer pressure switch not closing
Dirty air filter
Gas input to unit too Mw
Unit undersized for application
Restricted airflow
Limit switch cycles main burners
Incompbte combustion results in: Aldehyde odors,
carbon monoxide, sooting flame, floating flame
REMEDY
Drain. Install drip leg.
Check power supply fuses, wiring or circuit
breaker.
Check transformer.
NOTE: Some transformers have internal over-
current protection that requires s. cool-down peri-
od to reset.
Check all wiring and wire nut connections
Check flame ignition and sense electrode posi-
tioning.
Adiust as necessary.
1. Check gas line for air. Purge as necessary.
NOTE: After purging gas line of air, wait at least 5
minutes for any gas to dissipate before attempt-
ing to light unit.
2. Check gas valve.
1. Check pressure switch wires, connections,
and tubing. Repair or replace if necessary.
Clean or replace filter as necessary
Check gas pressure at manifold match with that
on unit nameplate
Replace with proper unit or add additional unit
CMs.n or replace filter. Remove any restriction.
Check rotation of blower, temperature rise of unit.
Adiust as necessary.
1. Tighten all screws around burner compartment
2. Cracked heat exchanger. Replace.
3. Unit over-fired. Reduce input (change orifices
or adiust gas line or manifold pressure).
4. Check burner alignment.
5. Inspect heat exchanger for bbckage. Clean
as necessary.
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