Enertech XT024, Руководство по установке и эксплуатации, Страница: 49 / 56

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IOM, XT Models Enertech Global
Section 12: Troubleshooting
UNIT WILL NOT START IN EITHER CYCLE
Thermostat
Set thermostat on heating and highest temperature setting. Unit should run. Set thermostat on cooling and
lowest temperature setting. Unit should run. Set fan to On position. Fan should run. If unit does not run in
any position, disconnect wires at heat pump terminal block and jump R, G, Y. Unit should run in heating. If
unit runs, replace thermostat with correct thermostat only.
Loose or broken wires Tighten or replace wires.
Blown Fuse/
Tripped Circuit Breakers
Check fuse size, replace fuse or reset circuit breaker.
Check low voltage circuit breaker.
Low Voltage Circuit
Check 24 volt transformer. If burned out or less than 24 volt, replace. Before replacing, verify tap setting
and correct if necessary.
BLOWER RUNS BUT COMPRESSOR WILL NOT START
(COMPRESSOR OVERLOAD, CAPACITOR BLOWN, HP FAULT)
Logic Board Check if logic board is working properly. Check status light for fault. See board imprint for blink faults.
Flow Switch
Temporarily bypass flow switch until compressor starts. If compressor runs properly, check switch. If
defective, replace. If switch is not defective, check for air in loop system. Make sure loop system is
properly purged. Verify flow rate before changing switch.
Defective capacitor Check capacitor. If defective, replace.
Frozen Compressor See charts O and P for compressor diagnostic. If compressor still doesn’t run, replace it.
BLOWER RUNS BUT COMPRESSOR SHORT CYCLES OR DOES NOT RUN
Wiring Loose or broken wires. Tighten or replace wires. See A: Unit will not start in either cycle.
Blown Fuse
Check fuse size. Check unit nameplate for correct sizing. Replace fuse or reset circuit breaker.
Check low voltage circuit breaker.
Flow Switch
Temporarily bypass flow switch for a couple seconds. If compressor runs properly, check switch. If
defective, replace. If switch is not defective, check for air in loop system. Make sure loop system is
properly purged. Verify flow rate before changing switch. .
Water Flow
If water flow is low (less than 3.5 GPM), unit will not start. Make sure Pump Module or solenoid valve is
connected (see wiring diagram). Water has to flow through the heat exchanger in the right direction (see
labels at water fitting connections) before the compressor can start. If water flow is at normal flow, use an
ohmmeter to check if you get continuity at the flow switch. If no switch is open and flow is a normal flow,
remove switch and check for stuck particles or bad switch.
High or low pressure switches
If heat pump is out on high or low-pressure cutout (lockout), check for faulty switches by jumping the
high and low-pressure switches individually. If defective replace. Check airflow, filters, water flow, loss of
refrigerant and ambient temperature. WARNING: Only allow compressor to run for a couple of seconds
with the high pressure switch jumpered
Defective logic board relay Jump or bypass relay. If defective, replace.
Low refrigerant charge Check for leaks and fix leaks.
NOISY BLOWER AND LOW AIR FLOW
Noisy Blower
Blower wheel contacting housing—Readjust.
Foreign material inside housing—Clean housing.
Loose duct work—Secure properly.
Low air flow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air filter—Clean or replace; obstruction in system—Visually check.
Balancing dampers closed, registers closed, leaks in ductwork. Repair.
Ductwork too small. Resize ductwork.
UNIT RUNNING NORMAL, BUT SPACE TEMPERATURE IS UNSTABLE
Thermostat
Thermostat is getting a draft of cold or warm air. Make sure that the wall or hole used to run thermostat
wire from the ceiling or basement is sealed, so no draft can come to the thermostat.
Faulty Thermostat (Replace).
Troubleshooting Tips