Bosch SM024 Specifications Page 51
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- Table of contents
- TROUBLESHOOTING
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troubleshooting | 51SM Series Heat Pump
6 720 220 406 (2013/1)SM Series Heat Pump
YELLOW "ALERT”
FLASH CODE 6
Open Start Circuit
Current only in run
circuit
1. Run capacitor has failed (may not be bad, verify)
2. Open circuit in compressor start wiring or connections
• Check wiring and connectors between supply and
the compressor "S'" terminal
3. Compressor start winding is damaged
• Check compressor motor winding resistance
YELLOW "ALERT”
FLASH CODE 7
Open Run Circuit
Current only in start
circuit
1. Open circuit in compressor run wiring or connections
• Check wiring and connectors between supply and
the compressor "R” terminal
2. Compressor run winding is damaged
• Check compressor motor winding resistance
YELLOW "ALERT"
FLASH CODE 8
Welded Contactor
Compressor always
runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
YELLOW "ALERT"
FLASH CODE 9
Low Voltage
Control circuit <
17VAC
1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect
is low)
• Check wiring connections Flash Code number
corresponds to a number of LED flashes, followed
by a pause and then repeated. TRIP and ALERT LEDs
flashing at same time means control circuit voltage
is too low for operation
Comfort Alert Module -Flash Codes
Status LED
Status LED
Description Status LED Troubleshooting Information Solution
HRP Troubleshooting
Problem Possible Cause Checks and Corrections
NO FLOW
LOW FLOW
No Power Check power supply
On/Off Switch Position Set switch to “ON” position
Compressor Contactor Engage heat pump contactor
Broken or loose wires Repair or tighten wires
Air Lock Purge air from piping system
Stuck pump shaft/impeller Remove pump cartridge and clean
Defective pump Replace pump
Kinked or under sized water piping Repair kink and check for proper line size
HIGH WATER
TEMPERATURE
Water temp limit closed Stuck limit switch
Sensor not attached securely to line
LOW HEAT OUTPUT Scaled or fouled heat exchanger Clean heat exchanger
- Heat pump 1
- CONTENTS 2
- MODEL NOMENCLATURE 3
- STANDARD PACKAGE 4
- GENERAL DESCRIPTION 4
- MOVING AND STORAGE 5
- INITIAL INSPECTION 5
- LOCATION 5
- Figure # 6 6
- Figure # 7 6
- Figure # 4 6
- Figure # 5 6
- Figure # 20 9
- Figure # 21 9
- Figure # 22 9
- Figure # 23 9
- Figure # 24 9
- Figure # 25 10
- Figure # 26 10
- Figure # 27 10
- Figure # 28 10
- Figure # 29 10
- Figure # 33 11
- Figure # 34 11
- Figure # 30 11
- Figure # 31 11
- Figure # 32 11
- COUNTER-FLOW CONFIGURABILITY 12
- VERTICAL CONFIGURABILITY 12
- Figure # 39 Back Discharge 13
- Figure # 40 Side Discharge 13
- Figure # 41 13
- Required Tools 14
- Access to Internal Components 14
- Figure # 43 15
- Figure # 44 15
- Figure # 45 15
- Figure # 46 15
- Blower Re-configuration 16
- Figure # 56 18
- Figure # 57 18
- Figure # 58 18
- Figure # 59 18
- Figure # 60 18
- Ensure to retain the spring 19
- HRP Switch Relocation 20
- Electric Heat Relocation 21
- Figure # 80 23
- Figure # 81 23
- Figure # 82 23
- Figure # 83 23
- Reinstall All Panels 24
- Figure # 87 25
- Figure # 88 25
- Figure # 89 25
- Figure # 90 25
- Figure # 91 25
- RETURN AND DISCHARGE DUCT 26
- MOUNTING VERTICAL UNITS 27
- MOUNTING HORIZONTAL UNITS 27
- CONDENSATE DRAIN 27
- DUCT SYSTEM 28
- ELECTRICAL 29
- Figure # 96 30
- Figure # 97 30
- Figure # 98 31
- Figure # 99 31
- ECM INTERFACE BOARD 33
- Hot Gas Reheat (HGRH) 35
- Electric Heat 35
- Heat Recovery Package (HRP) 35
- Figure # 101 36
- Figure # 102 36
- HEAT RECOVERY PACKAGE 38
- Water Tank Preparation 38
- HR Water Piping 38
- Water Tank Refill 38
- Initial Start-Up 39
- SEQUENCE OF OPERATION 40
- Cooling Mode 40
- Heating Mode 40
- APPLICATION CONSIDERATIONS 42
- Well Water Systems 42
- Cooling Tower/Boiler Systems 42
- Geothermal Systems 43
- Figure # 107 44
- SYSTEM CHECKOUT 45
- UNIT START-UP 45
- MAINTENANCE 45
- UNIT CHECK-OUT SHEET 47
- Customer Data 47
- Unit Nameplate Data 47
- Operating Conditions 47
- Auxiliary Heat 47
- UPM Board LED Indications 48
- Unit Troubleshooting 48
- Compressor Ohms 50
- HRP Troubleshooting 51
- ELECTRONIC THERMOSTAT 52
- INSTALLATION 52
- OPERATING TEMPERATURES AND 53
- PRESSURES 53
- COOLING HEATING 54
- AIRFLOW TABLES 58
- (SM0**-***-*** 58
- Table(SM0**-***-***-T*) 59
- WIRING DIAGRAMS 60
- Figure # 114 61
- Figure # 115 62
- Figure # 116 63
- Figure # 117 64
- Figure # 118 65
- Figure # 119 66
- WIRING HARNESS DRAWINGS 67
- Figure # 121 68
- SPARE PARTS LIST 69
- Vertical (VT) 69
- VT Parts List - Cabinet 71
- VT Parts List - Blower 72
- Electrical 73
- 6 720 220 408 (02) 74
- Horizontal (HZ) 76
- HZ Part List - Cabinet 78
- HZ Parts List - Blower 79
- HZ Parts List - Refrigeration 80
- HZ Part List - Panels 81
- HZ Part List - Detailed View 82
- Counter Flow Part List 83
- 6 720 220 430 (00) 85
- DIMENSIONAL DRAWINGS 90
- Horizontal - Straight Through 91
- Figure # 139 92
- Counter Flow 93
- Vertical 94
- Revised 05-12 96
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