Bosch EP018 User Manual

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Installation and Maintenance Manual

EP Series

8733953041 (2019/01)

EP007, EP009, EP012, EP015, EP018, EP024, EP030, EP036, EP042, EP048, EP060,EP070

Table of Contents

Questions and Answers:

K
Krystal GarrisonAug 16, 2025
What to do if my Bosch EP018 Heat Pump is off on high pressure control?
- V
  Vanessa ReevesAug 17, 2025
  If your Bosch Heat Pump shuts off due to high pressure, it could be due to several reasons. In cooling mode, check for inadequate water flow, excessively warm entering water temperature, or a scaled or plugged condenser. In heating mode, ensure adequate airflow by checking for an inoperative blower, clogged filter, or restrictions in the ductwork. Also, the unit might be overcharged with refrigerant, so reclaim the excess, evacuate, and recharge it with the factory-recommended amount. Finally, inspect the high-pressure switch for defects or improper calibration.
B
Brandon HartAug 22, 2025
Why is the blower operating but the compressor not in my Bosch Heat Pump?
- D
  Dennis GregoryAug 22, 2025
  If your Bosch Heat Pump's blower is running but the compressor isn't, check the thermostat settings, calibration, and wiring. Inspect for loose or broken wires at the compressor, capacitor, or contactor. Check the UPM board's red default LED for a Blink Code. If the compressor is cool and the overload won't reset, it may need replacement. A compressor motor grounded internally to the shell also necessitates replacement. After the compressor cools, check the continuity of its windings; open windings indicate the need for a replacement.
S
Savannah ValdezAug 27, 2025
What causes a Bosch Heat Pump to turn off on low pressure control?
- T
  Tami SotoAug 27, 2025
  If your Bosch Heat Pump is turning off due to low pressure, the suction pressure might be too low. In cooling mode, this could be due to inadequate airflow, excessively cold entering air temperature, an inoperative blower, a clogged filter, or ductwork restrictions. In heating mode, it could be due to inadequate water flow, excessively cold entering water temperature, or a scaled or plugged condenser. Also, the unit might be low on refrigerant, so check for leaks, repair them, evacuate the system, and recharge it with the factory-recommended amount. Finally, inspect the low-pressure switch for defects or improper calibration.
M
Mark SalazarAug 31, 2025
Why does my Bosch EP018 unit short cycle?
- M
  maciasrobertSep 1, 2025
  If your Bosch Heat Pump is short cycling, it might be oversized for the space, so recalculate the heating and cooling loads. The thermostat could be installed near a supply air grill; if so, relocate it and readjust the heat anticipator. Also, check the wiring and controls for a defective or improperly calibrated low-pressure switch.

Bosch EP018 Specifications

General

Brand	Bosch
Model	EP018
Category	Heat Pump
Language	English

Summary

Model Nomenclature

Model Size and Configuration

Specifies unit model sizes and cabinet configurations (Vertical/Horizontal).

Initial Inspection and General Description

Hanging Bracket Kit Installation

Piping and Water Systems

Thermostat Connections

ECM Interface Board and Terminals

Location and function of the ECM interface board and its terminals.

Thermostat Terminal Functions

Explanation of terminal connections (Y1, Y2, G, O, W1, etc.).

Thermostat Operation Details

Thermostat Terminal Functions Detailed

Detailed functions of thermostat terminals like EM, W1, O, Y1, Y2, G.

Safety Devices and UPM Controller

UPM Board Overview and Terminals

Description of the UPM board and its components (LEDs, terminals).

UPM Safety Control Functions

Overview of safety devices like pressure switches and freeze protection.

UPM Controller Settings and Features

UPM Board Default Settings

UPM Controller Functions

Details on UPM features, timers, bypass, protection, and diagnostics.

UPM Sequence of Operation

Cooling Mode Sequence

Flowchart detailing the sequence of operation for cooling mode.

Heating Mode Sequence

Flowchart detailing the sequence of operation for heating mode.

Sequence Legend and Faults

Heater Options and Water Quality

Electric Heater Package Details

Water Quality Management

Water Tank, Start-Up, and Hot Gas Reheat

Initial Start-Up Procedures

Hot Gas Reheat Functionality

Sequence of Operation

Cooling Mode Operation

Detailed sequence for cooling mode, including fan and compressor operation.

Heating Mode Operation

Detailed sequence for heating mode, including auxiliary and emergency heat.

Well Water Systems Considerations

Geothermal (Earth-Coupled) Systems

Ground Loop Pumping Package

System Checkout and Start-Up

Pre-Start-Up Checks

Verification of voltage, wiring, piping, blower, and vibration before operation.

Unit Start-Up Procedures

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

Maintenance Guidelines

Routine Maintenance Tasks

Lockout Fault Diagnosis

Identifying common causes of periodic lockouts and recommended actions.

Unit Check-Out Sheet

Operating Conditions Data

Data fields for recording operating parameters in cooling and heating modes.

Troubleshooting

UPM Board LED Indications

Table of UPM board LED blink codes and their meanings.

Unit Not Running Troubleshooting

Troubleshooting steps for when the entire unit does not run.

Blower Operates, Compressor Does Not

Troubleshooting steps for blower operation without compressor.

System Performance Troubleshooting

High Pressure Control Issues

Causes and checks for unit shutdown due to high pressure control.

Low Pressure Control Issues

Causes and checks for unit shutdown due to low pressure control.

Unit Short Cycles Troubleshooting

Troubleshooting steps for units that short cycle.

Insufficient Cooling or Heating

Causes and checks for inadequate cooling or heating performance.

HRP Troubleshooting

No Flow / Low Flow Issues

Troubleshooting steps for no or low flow conditions in the HRP system.

High Water Temperature

Low Heat Output

Refrigerant Pressure Ranges

Wiring Diagrams Overview

UPM Status LED Blink Codes

Explanation of UPM board LED blink codes for faults.

Wiring Diagram Notes

Unit Wiring Diagrams

Wiring Diagram (Figure #24)

Detailed wiring diagram for the unit.

Wiring Diagram (Figure #25)

Another wiring diagram illustrating connections.

Wiring Diagram (Figure #26)

Wiring diagram showing motor selection and connections.

Wiring Diagram (Figure #27)

Wiring diagram for the unit with ECM motor connections.

Electric Heat Wiring Diagrams

Electric Heat Wiring Diagram

Diagram specifically for electric heat wiring.

Electric Heat Element Ratings

Electric Heat Wiring Notes

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