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Bosch EP015 - User Manual

Bosch EP015
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EP Series
Installation and Maintenance Manual
8733922168 Revised 12-13

Table of Contents

Questions and Answers

  • J
    Jason MooreAug 12, 2025
    What to do if my Bosch Heat Pump is off on high pressure control?
    • D
      David MorganAug 12, 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.
  • M
    Michael HallAug 17, 2025
    Why is the blower operating but the compressor not in my Bosch EP015 Heat Pump?
    • M
      Megan WilliamsAug 17, 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.
  • K
    Kaitlyn SanchezAug 22, 2025
    What causes a Bosch Heat Pump to turn off on low pressure control?
    • D
      Darren FrankAug 22, 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.
  • J
    Jacob Briggs MDAug 27, 2025
    Why does my Bosch EP015 Heat Pump unit short cycle?
    • J
      Jonathan AlexanderAug 27, 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.
  • P
    Paige MckinneyNov 1, 2025
    How to troubleshoot a Bosch EP015 that does not run?
    • R
      Ruben RosalesNov 1, 2025
      If your entire Bosch Heat Pump unit isn't running, start by ensuring the power supply is on and the disconnect is closed. Check for blown fuses and replace them or reset the circuit breaker, making sure you're using the correct fuses. If the voltage supply is lower than the minimum specified on the unit's data plate, contact your local power company. Also, check the thermostat settings, calibration, and wiring. Set the fan to “ON”—it should run. Set the thermostat to “COOL” at the lowest temperature; the unit should cool. Set it to “HEAT” at the highest temperature; the unit should heat. If the blower or compressor doesn't run in any of these cases, the thermostat might be miswired or faulty. Verify 24 volts at the low voltage terminal strip between “R” and “C”, “Y” and “C”, and “O” and “C...
  • C
    Carlos BurnettNov 6, 2025
    Why is my Bosch EP015 Heat Pump providing insufficient cooling or heating?
    • B
      blake87Nov 6, 2025
      If your Bosch Heat Pump isn't providing enough cooling or heating, several factors could be at play. First, the unit might be undersized, so recalculate the heating or cooling loads. Adding insulation and shading might help. Check for air leaks in the ductwork or from outside through doors and windows. Ensure adequate airflow and proper air distribution, and replace any dirty filters. A low refrigerant charge can cause inefficient operation, so check the refrigerant levels. Inspect the compressor for defects; low discharge and high suction pressure indicate it's not pumping correctly, so replace it if needed. A defective reversing valve can also cause problems by bypassing refrigerant, so consider replacing it. Compare operating pressures to the unit's pressure/temperature chart. Check the...

Summary

Initial Inspection

Safety Considerations

Location

INSTALLATION

Condensate Drain

ELECTRICAL

Thermostat Connections

SAFETY DEVICES AND THE UPM CONTROLLER

SAFETY DEVICES AND THE UPM CONTROLLER

Overview of the Unit Protection Module (UPM) and its safety monitoring functions.

SEQUENCE OF OPERATION

Sequence of Operation - Modulating Hot Gas Reheat (MHGRH)

ELECTRIC HEAT

HEAT RECOVERY PACKAGE

ECM INTERFACE BOARD- CONSTANT AIRFLOW MOTOR (OPTION)

FLUID DIFFERENTIAL PRESSURE SWITCH (DPS)

System Checkout

UNIT START-UP

MAINTENANCE

Unit Specifications

PSC Motor Wiring Diagram

PSC Motor | Hot Gas Reheat | Single Phase | Single Stage

Wiring diagram for single-phase, single-stage PSC motor units with hot gas reheat.

X13 Motor Wiring Diagram

X13 Motor | Single Phase | Single Stage

EON Motor Wiring Diagram

EON Motor | Economizer | Three Phase | Single Stage

Unit Check-Out Sheet

X13 Motor | Dual Power Supply | Three Phase | Single Stage

Electric Heat Wiring Diagram

TROUBLESHOOTING

Entire unit does not run

Troubleshooting steps when the entire unit fails to power on or operate.

Blower operates but compressor does not

Steps to diagnose why the blower runs but the compressor does not.

Unit off on high pressure control

Unit off on low pressure control

Unit short cycles

Insufficient cooling or heating

Addresses problems related to inadequate cooling or heating performance.

UPM board trouble shooting

Guide for diagnosing issues with the Unit Protection Module (UPM) board.

Bosch EP015 Specifications

General IconGeneral
BrandBosch
ModelEP015
CategoryHeat Pump
LanguageEnglish

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