Bosch FHP EC151 User Manual

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Installation, operation and Maintenance Manual

EC Large Series

T111970289 (01/15)

072, 096, 120, 150, 151, 180, 181, 210, 240, 242, 300, 360.

Table of Contents

Questions and Answers:

A
Andrew RobertsAug 14, 2025
Why is my Bosch FHP EC151 Heat Pump not cooling or heating enough?
- H
  Holly HarrisAug 14, 2025
  Several factors can cause insufficient cooling or heating in your Bosch Heat Pump. It could be due to an undersized unit (recalculate heating/cooling loads, adding insulation/shading), loss of conditioned air (check for leaks in ductwork, doors, or windows), airflow issues (replace dirty filter), low refrigerant charge, a defective compressor (check discharge and suction pressures), a defective reversing valve, incorrect operating pressures (compare to pressure/temperature chart), a restricted or defective TXV (replace if needed), or contamination in the refrigerant system (reclaim refrigerant, replace filter dryer, evacuate, and recharge).
T
Terri ParkerAug 18, 2025
Why is my Bosch FHP EC151 off on high pressure control?
- H
  Hannah TurnerAug 18, 2025
  Your Bosch Heat Pump might be off due to the high-pressure control being triggered. This can happen because the discharge pressure is too high. In cooling mode, this could be due to a lack of water flow, entering water that is too warm, or a scaled/plugged condenser. In heating mode, it could be due to a lack of airflow, an inoperative blower, a clogged filter, or ductwork restrictions. Another cause could be that the unit is overcharged with refrigerant, needing to be reclaimed, evacuated, and recharged with the factory-recommended amount. Lastly, there might be a defective or improperly calibrated high-pressure switch.
L
Laura PowellAug 20, 2025
Why is my Bosch FHP EC151 unit off on low pressure control?
- B
  Barbara RodriguezAug 20, 2025
  Your Bosch Heat Pump may be shutting off due to the low-pressure control. This can be caused by low suction pressure. In cooling mode, this could be due to inadequate airflow, entering air that is too cold, an inoperative blower, a clogged filter, or restrictions in the ductwork. In heating mode, this could be due to a lack of water flow, entering water that is too cold, or a scaled or plugged condenser. Another possible cause is a low refrigerant charge; check for leaks, repair them, evacuate the system, and recharge it with the factory-recommended amount. Finally, the low-pressure switch itself might be defective or improperly calibrated.
B
bchapmanAug 27, 2025
What to do if my Bosch FHP EC151 unit short cycles?
- Z
  zcollinsAug 28, 2025
  If your Bosch Heat Pump is short cycling, it could be due to several reasons. First, the unit might be oversized, requiring a recalculation of heating and cooling loads. Second, the thermostat could be installed near a supply air grill; if so, relocate it and readjust the heat anticipator. Finally, there may be issues with the wiring and controls, such as a defective or improperly calibrated low-pressure switch.
J
Jennifer AndersenAug 31, 2025
Why is my Bosch FHP EC151 blower operating but the compressor does not?
- A
  Anthony RamosAug 31, 2025
  If the blower in your Bosch Heat Pump is working but the compressor isn't, check the thermostat setting, calibration, and wiring. Inspect the wiring at the compressor, capacitor, or contactor for any loose or broken wires. Also, check the UPM board red default L.E.D. for a Blink Code. If the compressor overload is open, and the compressor is cool and won't reset, replace the compressor. If the compressor motor is grounded (internal winding grounded to the compressor shell), replace the compressor and install a suction filter dryer if there was a compressor burnout. Lastly, after the compressor has cooled, check the continuity of the compressor windings; if they're open, replace the compressor.
A
ashleymoranSep 3, 2025
What causes no or low flow in my Bosch FHP EC151?
- A
  angelthomasSep 3, 2025
  No or low flow in your Bosch Heat Pump can stem from several issues. Begin by checking the power supply and ensuring the on/off switch is in the “ON” position. Verify the compressor contactor is engaged. Inspect for broken or loose wires and repair or tighten them as needed. Purge any air from the piping system. If the pump shaft/impeller is stuck, remove the pump cartridge and clean it. If the pump is defective, replace it. Lastly, check for kinked or undersized water piping and repair any kinks, ensuring the line size is correct.
M
Michael PalmerSep 6, 2025
What causes high water temperature in Bosch FHP EC151?
- J
  Jeffery ThompsonSep 6, 2025
  High water temperature in your Bosch Heat Pump may be due to a water temperature limit being closed, a stuck limit switch, or a sensor not securely attached to the line.
M
millerdanielleSep 10, 2025
What causes low heat output in Bosch FHP EC151?
- P
  penningtonjennaSep 10, 2025
  Low heat output in your Bosch Heat Pump can be caused by a scaled or fouled heat exchanger. Cleaning the heat exchanger might resolve the issue.

Bosch FHP EC151 Specifications

General

Model	EC151
Power Input Cooling	1.3 kW
Series	FHP
Nominal Cooling Capacity	5.1 kW
Nominal Heating Capacity	6.0 kW
Refrigerant	R410A

Summary

Safety Information and Symbols

Key to Symbols

Identifies symbols used to convey important information and warnings.

Understanding Warnings

Explains warning symbols and keywords for safety awareness.

Initial Inspection and Safety

Initial Inspection

Verifies unit components and checks for shipping damage upon arrival.

Installation and Servicing Safety

Essential safety warnings for handling and maintaining the equipment.

Installation and Site Preparation

Thermostat and UPM Configuration

Safety Devices and UPM Controller

UPM Controller Overview

Description of the Unit Protection Module and its safety functions.

UPM Board Components

UPM Board Settings and Features

UPM Board Default Settings

UPM Board Operational Features

Explanation of timers, random start, and protection features.

Unit Fault Detection and Response

Fault Output Signals

Describes malfunction outputs, display outputs, and LED fault indications.

Fault Handling and Reset Procedures

Details intelligent resets, hard lockouts, and reset methods.

Thermostat Installation and Water Quality

Water Quality Management and Table

UPM Sequence of Operation

Heat Recovery Package (HRP) Installation

Sequence of Operation and Applications

Cooling and Heating Mode Operation

System Checkout and Unit Start-Up

System Checkout Procedures

Unit Start-Up Guide

Step-by-step guide for starting the unit in cooling and heating modes.

Maintenance Procedures

Annual Service and Drain Checks

Unit Check-Out Sheet

Troubleshooting Introduction

UPM Board LED Indications

Table correlating LED status and blink codes with specific faults.

Unit Troubleshooting Guide

Common problems, possible causes, and checks for unit operation issues.

Troubleshooting Unit Issues

Pressure Control and Capacity Issues

Diagnosing problems related to pressure controls and insufficient cooling/heating.

HRP Troubleshooting

Operating Temperatures and Pressures

Wiring Diagrams

Electrical Schematics and Component Layouts

Detailed diagrams showing electrical connections, components, and UPM module functions.

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