Bosch FHP EC096 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:

B
Brett AllisonAug 15, 2025
Why is my Bosch Heat Pump not cooling or heating enough?
- K
  Kiara ColemanAug 15, 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
Tiffany GonzalesAug 18, 2025
Why is my Bosch FHP EC096 Heat Pump off on high pressure control?
- K
  Kristy TrujilloAug 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.
A
Alejandro CollinsAug 21, 2025
Why is my Bosch FHP EC096 Heat Pump unit off on low pressure control?
- J
  Joe NorrisAug 21, 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.
M
Michelle HallAug 28, 2025
What to do if my Bosch Heat Pump unit short cycles?
- H
  Holly GrossAug 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.
C
Carrie HopkinsSep 1, 2025
Why is my Bosch Heat Pump blower operating but the compressor does not?
- R
  Russell McfarlandSep 1, 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.
E
Elizabeth CrawfordSep 4, 2025
What causes no or low flow in my Bosch Heat Pump?
- K
  kimberlyhamiltonSep 4, 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.
C
Craig JamesSep 7, 2025
What causes high water temperature in Bosch FHP EC096?
- A
  Aaron McbrideSep 7, 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.
C
Charles CruzSep 12, 2025
What causes low heat output in Bosch FHP EC096 Heat Pump?
- K
  Kevin JacksonSep 12, 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 EC096 Specifications

General

Brand	Bosch
Model	FHP EC096
Category	Heat Pump
Language	English

Summary

Model Nomenclature

Initial Inspection

Installation

Electrical

ECM Interface Board

Thermostat Connections

Thermostat Wiring

Connecting thermostat to the ECM Interface Board and wiring details.

Safety Devices and the UPM Controller

UPM Board Factory Default Settings

Table showing factory default settings for the UPM board.

UPM Board Features

UPM Controller Safety Features

L.E.D. Fault Indication

Explanation of LED indicators and their fault blink codes.

Lockout Reset

Procedure for resetting a hard lockout condition.

Electronic Thermostat Installation

Water Quality

Importance of water quality for heat pump life and warranty.

UPM Sequence of Operation

Water Quality Table

Heat Recovery Package

Initial Start-Up

Hot Gas Reheat (HGRH)

Sequence of Operation

Cooling Mode

Heating Mode

System Checkout

Unit Start-Up

Step-by-step guide for unit start-up in cooling and heating modes.

Maintenance

Filter Changes and Cleaning

Periodic Lockouts

Unit Check-Out Sheet

Unit Nameplate Data

Troubleshooting

UPM Board LED Indications

Table mapping LED colors and blinks to specific faults.

Unit Troubleshooting

Table addressing common unit problems, causes, and solutions.

HRP Troubleshooting

Operating Temperatures and Pressures

Operating Data

Wiring Diagrams

General Unit Wiring Diagram

UPM II with HGRH Wiring Diagram

UPM II Boilerless Wiring Diagram

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