Bosch TA025 Installation And Maintenance Manual page 27

Troubleshooting
Insufficient
Unit undersized
cooling or
heating Loss of conditioned
air by leakage
Airflow
Refrigerant charge
Compressor
Reversing Valve
Operating
pressures
TXV
Moisture,
noncondensables
Revised 03-11
Recalculate heating and or cooling loads. If excessive, possibly adding
insulation and shading will rectify the problem
Check for leaks in duct work or introduction of ambient air through
doors or windows
Lack of adequate air flow or improper distribution of air. Replace dirty
filter
Low on refrigerant charge causing inefficient operation
Check for defective compressor. If discharge is too low and suction
pressure is too high, compressor is not pumping properly. Replace
compressor.
Defective reversing valve creating bypass of refrigerant from discharge
of suction side of compressor. Replace reversing valve
Compare unit operation pressures to the pressure/temperature chart
for the unit.
Check TXV for possible restriction or defect. Replace if necessary.
The refrigerant system may be contaminated with moisture or
noncondensables. Reclaim refrigerant, replace filter dryer, evacuate the
refrigerant system, and recharge with factory recommended charge.
Subject to change without prior notice
TA Series
6 720 220 046
27