Bosch LV041 User Manual (English)

Questions and Answers:

T
Thomas WrightAug 22, 2025
Why is my Bosch LV041 not shifting into cooling?
- E
  Elizabeth AndersonAug 22, 2025
  If your Bosch Heat Pump isn't shifting into cooling mode, check that the reversing valve solenoid is receiving 24 VAC. If it is, check the resistance of the solenoid; an open circuit may indicate a burned out solenoid. Also, check that the reversing valve thermostat wire is connected to the 'O' terminal of the thermostat and check for a contact closure between 'O' and 'R'. Finally, check that the wires from the thermostat to the unit are securely connected and that the wires from the electrical box to the reversing valve are connected.
S
Stacy GrayAug 23, 2025
How to reduce objectionable noise levels from my Bosch LV041 Heat Pump?
- N
  nealconnieAug 23, 2025
  If you're experiencing objectionable noise levels from your Bosch Heat Pump, ensure the duct work and grilles are properly sized for unit air flow. If the fan speed setting is too high, consult the blower performance table and reduce fan speed if possible. To address structure borne noise, mount the unit on a vibration pad. Also, install the unit in accordance with the provided instructions and adjust the unit location to prevent it from touching the structure.
S
Sharon ColonAug 25, 2025
What to do if my Bosch Heat Pump compressor isn't running and the fan is on, but I suspect low refrigerant?
- J
  Joshua ColemanAug 26, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a low-pressure fault caused by low refrigerant. Check the refrigerant pressure with a gauge set.
J
Jessica RogersAug 26, 2025
What to do if the compressor of my Bosch LV041 Heat Pump doesn't work but the fan runs and there is a freeze fault?
- I
  ihaleAug 27, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a freeze fault in the water coil caused by no or low water flow. Check the water valves and/or pumps to ensure they are operating correctly. Also, check the water coil for any blockages.
K
Kenneth WardAug 27, 2025
Why is my Bosch LV041 compressor not running but the fan is, possibly due to high water temperature?
- T
  Tanya WhiteAug 27, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by high water temperature. Check the water temperature to ensure it is within the appropriate range.
R
Ronnie RamosAug 29, 2025
How to troubleshoot a Bosch LV041 with no compressor operation but running fan, possibly due to a fouled water coil?
- D
  Deborah HallAug 29, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by a fouled or scaled water coil. Check for proper flow rate and water temperature, especially looking for a low water side temperature rise during cooling.
R
Reginald MedinaAug 30, 2025
What to do if my Bosch Heat Pump compressor isn't running but the fan is, and I suspect airflow issues?
- C
  Cathy AbbottAug 30, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a high-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
M
Miss Debra ButlerAug 31, 2025
Why is my Bosch LV041 Heat Pump compressor not running but the fan is, possibly due to low airflow?
- L
  Laura BowenSep 1, 2025
  If your Bosch Heat Pump's compressor isn't running but the fan is, it could be due to a low-pressure fault caused by no or low airflow. Check the fan motor to ensure it is operating correctly.
K
kellygibsonSep 2, 2025
What to do if my Bosch LV041 compressor isn't running but the fan is on and I suspect an overloaded control circuit?
- E
  Erin OsbornSep 2, 2025
  If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by an overloaded control circuit. Check the control voltage; if it's below 18V, inspect the accessories connected to the unit and ensure they don't exceed the VA draw.
J
Jose Gilbert MDSep 3, 2025
How to troubleshoot a Bosch Heat Pump with no compressor operation but running fan, possibly due to a bad thermostat connection?
- S
  Scott YoderSep 3, 2025
  If the compressor of your Bosch Heat Pump is not working, but the fan is running, it might be due to a brown-out fault caused by a bad thermostat connection. Check that the thermostat wiring is of the proper gauge and length, is undamaged, and that all connections at the thermostat and heat pump are secure.

Bosch LV041 Specifications

General

Brand	Bosch
Model	LV041
Refrigerant	R410A
Power Supply	208-230V, 1 Phase, 60Hz
Noise Level (Outdoor)	56 dB(A)
Operating Temperature (Cooling)	64°F - 115°F

Summary

Key Symbols and Safety Information

Warnings and Safety Indicators

Explains risk indicators like DANGER, WARNING, CAUTION, NOTICE.

Safety Warnings and Precautions

Crucial safety advice for installation, adjustment, service, and use of equipment.

Installation Preparation

Job Site and Unit Inspection

Verifies site readiness, reads manuals, checks system, and inspects shipment for damage.

Installation Procedures

Unit Location and Environment Warnings

Guidance on selecting an appropriate indoor location and avoiding hazardous environments.

Unit Mounting Instructions

Vertical and Horizontal Mounting

Details on mounting vertical units on pads and horizontal units with pitching.

Hanging Bracket Kit Installation

Bracket Installation Procedure

Critical Safety Warnings for Hanging

Duct System Check and Conversion

Duct System Inspection

Guidelines for inspecting and ensuring the duct system is properly sized and installed.

Condensate Drain Installation

Pipe Connections and Wiring

Water Piping Installation

Guidance on water piping connections, including insulation, corrosion, and flushing.

Field Power Supply Wiring

Detailed instructions for wiring the unit's power supply, including high voltage and dual supplies.

Low Voltage Wiring and Controls

Thermostat Wiring Precautions

Safety warning to prevent routing control wiring with power supply wiring.

Field Control Wiring

ECM-UPM Control Wiring

Wiring of thermostat to ECM Interface Board and its functions.

ECM Interface Board Overview

Explanation of the ECM interface board's role in translating inputs and indicating status.

UPM Control and Safety Features

Unit Safety Features

Freeze Protection Systems

Explanation of freeze protection sensors and their function.

UPM Board Operational Features

Details UPM board protections: anti-short cycle, random start, bypass, and power interruption.

Freeze Sensor Operation and Settings

Flow Switch Recommendation

Recommends a flow switch to prevent operation without water flow.

Intelligent Reset and Lockout Procedures

Intelligent Reset Procedure

Describes the automatic restart sequence after a fault and conditions for hard lockout.

Lockout Reset Procedure

Procedures for manually resetting a hard lockout condition.

Thermostat and UPM Wiring Details

Pre-Start-Up System Checklist

Pre-Startup System Checkout Steps

Steps to verify voltage, connections, piping, and blower rotation before energizing.

Operating Limits and Start-Up Procedures

Unit Start-Up Procedure

Procedure to initiate proper start-up of the heat pump unit.

Electrical Panel Safety Warning

Safety warning about high voltage presence in the electrical panel.

Start-Up Procedures

Scroll Compressor Rotation Check

Procedure to determine and correct improper compressor rotation direction.

Sequence of Operation

Unit Operation Flowchart

ECM Control Board Operation

Dehumidification Flowchart

Unit Start-Up Modes

Cooling Mode Start-Up Procedure

Heating Mode Start-Up Procedure

Water Flow Regulation and Flushing

Water Flow Regulation Methods

Piping System Flushing Procedure

Flushing Power Disconnect Warning

Water Loop Applications

Antifreeze Selection and Use

Freeze Protection Adjustment

Water Loop System Types

Open Well Water Systems

Water Quality Importance

Water Quality and Warranty Warning

Piping Installation Guidelines

Fan Motor Options

ECM Fan Motor Options

Constant Airflow ECM Motors

Standard Blower Motor Specifications

ECM Blower Motor Specifications

Troubleshooting Guide

Unit Troubleshooting Overview

Table listing problems, modes, checks, causes, and actions for troubleshooting.

Troubleshooting (Continued)

Fan Runs, No Compressor Operation

Further troubleshooting for fan running without compressor operation.

Compressor and Fan Operation Issues

Diagnosing compressor overload or poor wiring.

ECM Constant Airflow Fan Issues

Diagnosing fan operation for constant airflow ECM motors.

High Humidity Resolution

Addressing high humidity due to airflow, refrigerant, or unit sizing.

No Compressor or Fan Operation

Troubleshooting steps when neither compressor nor fan operates.

Power and Transformer Issues

Diagnosing low/no supply power or faulty control transformer.

Unit Shifting Mode Issues

Troubleshooting reversing valve operation and thermostat connections.

Noise Level Troubleshooting

Troubleshooting noise issues related to vibration, mounting, and duct design.

PSC Motor Fan Operation Issues

Troubleshooting for PSC motor fan not operating.

PSC Motor Fan Relay and Motor Issues

Troubleshooting fan relay and motor issues for PSC motors.

Air Temperature Control Issues

Addressing airflow and filter issues causing incorrect air temperatures.

Compressor Noise Diagnosis

Diagnosing compressor noise related to water temperature or coil condition.

ECM Motor Fan Operation Issues

Troubleshooting for constant torque ECM motor fan not operating.

ECM Motor Fan Relay and Motor Issues

Troubleshooting fan operation for constant torque ECM motors.

System Performance Issues

Diagnosing water temperature, duct leaks, and refrigerant charge issues.

Water Hammer Resolution

Identifying and resolving water hammer caused by valve type.

Wiring Diagrams

UPM Status LED Blink Codes

Explains UPM status LED blink codes for fault identification.

Wiring Diagrams (Continued)

Maintenance Guidelines

Filter Changes and Annual Checkups

Unit Check-Out Sheet

Operating Conditions Recording

Related product manuals

Bosch LV041 User Manual

Table of Contents

Questions and Answers:

Bosch LV041 Specifications

Summary

Key Symbols and Safety Information

Warnings and Safety Indicators

Safety Warnings and Precautions

Installation Preparation

Job Site and Unit Inspection

Installation Procedures

Unit Location and Environment Warnings

Unit Mounting Instructions

Vertical and Horizontal Mounting

Hanging Bracket Kit Installation

Bracket Installation Procedure

Critical Safety Warnings for Hanging

Duct System Check and Conversion

Duct System Inspection

Condensate Drain Installation

Pipe Connections and Wiring

Water Piping Installation

Field Power Supply Wiring

Low Voltage Wiring and Controls

Thermostat Wiring Precautions

Field Control Wiring

ECM-UPM Control Wiring

ECM Interface Board Overview

UPM Control and Safety Features

Unit Safety Features

Freeze Protection Systems

UPM Board Operational Features

Freeze Sensor Operation and Settings

Flow Switch Recommendation

Intelligent Reset and Lockout Procedures

Intelligent Reset Procedure

Lockout Reset Procedure

Thermostat and UPM Wiring Details

Pre-Start-Up System Checklist

Pre-Startup System Checkout Steps

Operating Limits and Start-Up Procedures

Unit Start-Up Procedure

Electrical Panel Safety Warning

Start-Up Procedures

Scroll Compressor Rotation Check

Sequence of Operation

Unit Operation Flowchart

ECM Control Board Operation

Dehumidification Flowchart

Unit Start-Up Modes

Cooling Mode Start-Up Procedure

Heating Mode Start-Up Procedure

Water Flow Regulation and Flushing

Water Flow Regulation Methods

Piping System Flushing Procedure

Flushing Power Disconnect Warning

Water Loop Applications

Antifreeze Selection and Use

Freeze Protection Adjustment

Water Loop System Types

Open Well Water Systems

Water Quality Importance

Water Quality and Warranty Warning

Piping Installation Guidelines

Fan Motor Options

ECM Fan Motor Options

Constant Airflow ECM Motors

Standard Blower Motor Specifications

ECM Blower Motor Specifications

Troubleshooting Guide

Unit Troubleshooting Overview

Troubleshooting (Continued)

Fan Runs, No Compressor Operation

Compressor and Fan Operation Issues

ECM Constant Airflow Fan Issues

High Humidity Resolution

No Compressor or Fan Operation

Power and Transformer Issues

Unit Shifting Mode Issues

Noise Level Troubleshooting