Bosch TW Series User Manual

Bosch TW Series

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Installation, Operation and Maintenance Manual

TW Series

6720220047 (2016/02)

Water to Water

Table of Contents

Other manuals for Bosch TW Series

Installation And Maintenance Manual24 pages

Questions and Answers:

A
Andrew OwensAug 21, 2025
Why is my Bosch TW not running?
- D
  david65Aug 21, 2025
  The Bosch Heat Pump might not be running due to several reasons. It could be due to the power supply being off, in which case you should apply power and close the disconnect. Another cause could be a blown fuse, requiring you to replace the fuse or reset the circuit breaker, ensuring you use the correct fuses. Finally, a low voltage supply could be the issue. If the voltage is below the minimum specified on the unit's data plate, contact your local power company.
C
Cynthia StantonAug 25, 2025
What to do if my Bosch TW Heat Pump unit is off on high pressure control?
- J
  Jeffrey JohnsonAug 25, 2025
  If your Bosch Heat Pump unit is off due to high pressure control, it could be due to several reasons. If in cooling mode, there may be a lack of or inadequate water flow, the entering water temperature may be too warm, or the condenser may be scaled or plugged. If in heating mode, there may be a lack of or inadequate load-side fluid flow. Also, the unit might be overcharged with refrigerant. In this case, reclaim the refrigerant, evacuate, and recharge with the factory-recommended charge. Finally, there may be a defective or improperly calibrated high-pressure switch.
D
David MartinAug 27, 2025
What to do if my Bosch Heat Pump unit is off on low pressure control?
- D
  Denise SmithAug 27, 2025
  If your Bosch Heat Pump unit is off due to low pressure control, it could be due to several reasons. If in cooling mode, there may be a lack of or inadequate source-side fluid flow, or the entering water temperature may be too cold. If in heating mode, there may be a lack of or inadequate water flow, the entering water temperature may be too cold, or the condenser may be scaled or plugged. Also, the unit might be low on refrigerant. In this case, check for a refrigerant leak, repair it, evacuate, and recharge with the factory-recommended charge. Finally, there may be a defective or improperly calibrated low-pressure switch.
M
Marilyn HillAug 28, 2025
What to do if there is no or low flow in my Bosch TW?
- S
  Sara CrawfordAug 28, 2025
  If you're experiencing no or low flow in your Bosch Heat Pump, consider the following: * Check the power supply. * Ensure the on/off switch is in the “ON” position. * Engage the heat pump contactor. * Repair or tighten any broken or loose wires. * Purge air from the piping system. * Remove the pump cartridge and clean if the pump shaft/impeller is stuck. * Replace the pump if it is defective. * Repair any kinks in the water piping and check for proper line size.
J
Jennifer MccarthyAug 31, 2025
Why does my Bosch TW Heat Pump short cycle?
- D
  Dalton LopezAug 31, 2025
  Your Bosch Heat Pump might be short cycling due to several reasons. The unit may be oversized, requiring a recalculation of heating and cooling loads. The thermostat might be installed near a supply air grill, in which case you should relocate it, or the heat anticipator may need readjustment. Also, check for a defective or improperly calibrated low-pressure switch.
W
Whitney JohnsonSep 1, 2025
What does yellow alert flash code 5 mean on my Bosch Heat Pump?
- H
  Hannah NicholsonSep 1, 2025
  A yellow alert flash code 5 on your Bosch Heat Pump indicates an open circuit. Possible causes include: 1. An open outdoor unit power disconnect. 2. An open compressor circuit breaker or fuse(s). 3. A failed open compressor contactor. Check the contactor wiring and connectors, look for signs of failure (burned, pitted, or open), and check for low pilot voltage at the compressor contactor coil. 4. An open high-pressure switch that requires manual reset. 5. An open circuit in the compressor supply wiring or connections. 6. An unusually long compressor protector reset time due to extreme ambient temperature. 7. Damaged compressor windings. Check the compressor motor winding resistance.
H
Hannah JacksonSep 3, 2025
What does yellow alert flash code 4 mean on my Bosch TW?
- L
  Lisa RoySep 3, 2025
  A yellow alert flash code 4 on your Bosch Heat Pump indicates a locked rotor. This could be due to a failed run capacitor (verify if it's bad), low line voltage (contact utility if voltage at disconnect is low and check wiring connections), excessive liquid refrigerant in the compressor, or seized compressor bearings (measure compressor oil level).
E
Elizabeth MasonSep 4, 2025
What does yellow alert flash code 3 mean on my Bosch TW Heat Pump?
- W
  williamschmidtSep 4, 2025
  A yellow alert flash code 3 on your Bosch Heat Pump indicates short cycling. This can be due to an intermittent thermostat demand signal, a defective time delay relay or control board. If a high-pressure switch is present, refer to Flash Code 2 information; if a low-pressure switch is present, refer to Flash Code 1 information.
K
Kimberly RamirezSep 6, 2025
What does yellow alert flash code 6 mean on my Bosch TW Heat Pump?
- A
  Ashley SanchezSep 6, 2025
  A yellow alert flash code 6 on your Bosch Heat Pump indicates an open start circuit, with current only in the run circuit. This could be due to a failed run capacitor (verify if it's bad), an open circuit in the compressor start wiring or connections (check wiring and connectors between the supply and the compressor "S" terminal), or damaged compressor start winding (check compressor motor winding resistance).
E
Elijah McintoshSep 7, 2025
What does yellow alert flash code 7 mean on my Bosch TW Heat Pump?
- P
  Patricia KlineSep 8, 2025
  A yellow alert flash code 7 on your Bosch Heat Pump indicates an open run circuit, with current only in the start circuit. This could be due to an open circuit in the compressor run wiring or connections (check wiring and connectors between the supply and the compressor "R" terminal), or a damaged compressor run winding (check compressor motor winding resistance).

Bosch TW Series Specifications

General

Brand	Bosch
Model	TW Series
Category	Heat Pump
Language	English

Summary

Safety Warnings

Model Nomenclature

Standard TW Package

Installation

Instructions for mounting the unit on a vibration absorbing pad.

Safety Devices and the UPM Controller

UPM Controller Settings and Features

Factory Default Settings

Lists default UPM board parameter configurations.

DIP Switch Settings

Details UPM board DIP switch default positions for functions.

Key UPM Features

Describes UPM features like anti-short cycle, random start, low pressure bypass.

SEQUENCE OF OPERATION

Cooling Mode

Heating Mode

SEQUENCE OF OPERATION FLOW

SYSTEM CHECKOUT

WATER TO WATER UNIT CONTROLLER

Features

Lists key features of the Bosch water heat pump controller.

Unit Sensors

Modes Of Operation

Details unit operational modes: Off, Heating, Cooling.

Auto Changeover Mode

Unit Protection

Describes controller protection against faults and ensuring safe operation.

MANUAL LOCKOUT

OPERATING INSTRUCTIONS

User Interface

USER ADJUSTABLE SETTINGS CHART

SETTING UP THE CONTROLLER

INITIAL CONFIGURATION

Unit Troubleshooting

Comfort Alert Module - Flash Codes

Unit Lockouts

UPM Board LED Indications

WIRING DIAGRAMS

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