Bosch SM070 Specifications download pdf (Page 47)

100

Troubleshooting | 47SM Series Heat Pump

6 720 220 406 (2013/9)Revised 08-13

TROUBLESHOOTING

SM Series Water Source Heat Pump is equipped

with a externally mounted LCD screen that

displays unit errors. (Figure #106)

Figure # 106

Troubleshooting Information Solution

column may reflect a possible fault that

may be one of, or a combination of

causes and solutions. Check each cause

and adopt "process of elimination" and

or verification of each before making

any conclusion.

UPM Board LED Indications

Indication

Color Blinks Description

GREEN Solid 18-30 VAC Power is present

RED 1 High pressure lockout

RED 2 Low pressure lockout

RED 3 Freeze sensor lockout

RED 4 Condensate overflow

RED 5 Brownout

RED 6 Evaporator Freeze condition

Unit Troubleshooting

Problem Possible Cause Checks and Correction

ENTIRE UNIT

DOES NOT RUN

Power Supply Off Apply power, close disconnect

Blown Fuse

Replace fuse or reset circuit breaker. Check for correct fuses

Voltage Supply

Low

If voltage is below minimum voltage specified on unit data plate,

contact local power company.

Thermostat

Set the fan to “ON”, the fan should run. Set thermostat to “COOL” and

lowest temperature setting, the unit should run in the cooling mode

(reversing valve energized). Set unit to “HEAT” and the highest

temperature setting, the unit should run in the heating mode. If neither

the blower or compressor run in all three cases, the thermostat could

be miswired or faulty. To ensure miswired or faulty thermostat verify 24

volts is available on the condensing section low voltage terminal strip

between “R” and “C”, “Y” and “C”, and “O” and “C”. If the blower does

not operate, verify 24 volts between terminals “G” and “C” in the air

handler. Replace the thermostat if defective.

BLOWER

OPERATES BUT

COMPRESSOR

DOES NOT

Thermostat

Check setting, calibration, and wiring

Wiring

Check for loose or broken wires at compressor, capacitor, or contactor.

Safety Controls

Check UPM board red default L.E.D. for Blink Code

Compressor

overload open

If the compressor is cool and the overload will not reset, replace

compressor.

Compressor

motor grounded

Internal winding grounded to the compressor shell. Replace

compressor. If compressor burnout, install suction filter dryer.

Compressor

windings Open

After compressor has cooled, check continuity of the compressor

windings. If the windings are open, replace the compressor

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Bosch SM070 Specifications Page 47

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