Maritime Geothermal TF Series

Questions and Answers

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David MorganAug 15, 2025
What to do if my Maritime Geothermal TF Heat Pump compressor will not start?
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  Megan SheltonAug 15, 2025
  If your compressor won't start, there could be several reasons: * A faulty control board: Replace the control board. * A faulty run capacitor (single phase only): Replace it if faulty. * Loose or faulty wiring: Fix any loose connections and replace any damaged wires. * A faulty compressor contactor: Replace the contactor. * Thermal overload on the compressor tripped: Refer to Operation Troubleshooting to determine the cause. * Burned out motor (open or shorted windings): Replace the compressor. * Motor shorted to ground: If any terminal to ground is not infinite, replace the compressor. * Seized compressor: Attempt to “rock” compressor free. If normal operation cannot be established, replace the compressor.
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Kristen VelazquezAug 18, 2025
What to do if my Maritime Geothermal TF has no power?
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  stevenjensenAug 18, 2025
  If there is no power to the heat pump, it could be due to the following reasons: * Disconnect switch open (if installed): Determine why the disconnect switch was opened; if all is OK, close the switch. * Fuse blown / breaker tripped: Reset breaker or replace fuse with proper size and type (Time-delay type “D”).
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Drew LongAug 21, 2025
What to do if my Maritime Geothermal TF has high discharge pressure?
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  Luis FloresAug 22, 2025
  High discharge pressure can be caused by: * Low or no indoor loop flow: Verify the pump is working and sized correctly and check for restrictions in the circuit, such as a partially closed valve. * Temperature setpoint(s) too high (if using external aquastat or BACnet control): Reduce the setpoint(s). * EEV stuck almost closed or partially blocked: Refer to the EEV troubleshooting section. * Filter-dryer plugged: Replace the filter-dryer. * Unit is overcharged: Remove 1/2 lb of refrigerant at a time and verify that the discharge pressure reduces.
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Samantha ColeAug 28, 2025
What to do if my Maritime Geothermal Heat Pump compressor starts hard?
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  mcarrAug 29, 2025
  If the compressor starts hard, it could be due to: * A faulty start capacitor (Single phase only): Replace if faulty. Remove black residue in electrical box if any. * A faulty potential relay (Single phase only): Replace if faulty. * Compressor is “tight” due to damaged mechanism: Attempt to “rock” compressor free. If normal operation cannot be established, replace compressor.
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annette46Sep 1, 2025
Why is there no display on my Maritime Geothermal Heat Pump air thermostat?
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  seanalvarezSep 1, 2025
  If there is no display on the air thermostat, it could be due to: * No power from transformer: Check 'No Heartbeat on control board'. * Faulty wiring between heat pump and thermostat: Correct the wiring. * Faulty thermostat: Replace the thermostat.
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Christopher ArmstrongSep 4, 2025
What does it mean if there is no heartbeat on the control board of my Maritime Geothermal TF Heat Pump?
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  Jessica WilliamsSep 4, 2025
  If there is no heartbeat on the control board, it could be due to: * Transformer breaker tripped (or fuse blown for those without breaker): Push breaker back in. If it trips again locate cause of short circuit and correct (or replace fuse). * Faulty transformer: Replace transformer. * Faulty Control Board: Replace the control board.
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Steven SmithSep 7, 2025
What to do if my Maritime Geothermal Heat Pump settings are not retained?
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  Rebecca ColemanSep 7, 2025
  If settings are not retained, the cause may be a faulty aquastat. In this case, replace the aquastat.
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Amy HoustonSep 12, 2025
What to do if my Maritime Geothermal TF Heat Pump experiences a random high pressure trip?
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  Melissa ClarkSep 12, 2025
  A random high pressure trip may be caused by a faulty indoor circulator relay. If this is the case, replace the relay.
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Brandon BarnesNov 24, 2025
What to do if my Maritime Geothermal TF has low suction pressure?
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  jwilliamsNov 24, 2025
  Low suction pressure can be caused by: * Low or no outdoor loop liquid flow: Determine the cause of the flow restriction and correct it. Verify pumps are working and sized correctly for ground loop systems. Verify well pump and water valve is working for ground water systems. * Outdoor loop entering liquid temperature too cold: Increase the size of the ground loop. * Dirty or fouled outdoor loop coaxial coil: Backflush the coaxial exchanger with a calcium-removing cleaning solution. * Return air too cold: Restrict air flow temporarily until room comes up to temperature. * TS1 temperature sensor not reading properly: Verify EEV position is low compared to normal. Check temperature sensor, replace if necessary. * Filter-dryer plugged: Replace filter-dryer. * EEV stuck almost c...

Summary

TF System Description and Operation

General Overview and System Modes

Introduces the TF-series heat pump and its operating modes (Air Heating, Hydronic Heating, Air Cooling).

Mode Selection, Priority, and Auxiliary Heat

Covers setting operational priority, managing simultaneous demands, and auxiliary heat functions.

Sizing, Installation, and Wiring

TF-Series Sizing and Installation Basics

Guidelines for selecting unit size and basic installation materials and procedures.

Wiring, Electrical Connections, and Loop Systems

Details on electrical hookups, pump wiring, and various loop system connections.

Loop Systems and Piping

Ground Loop Installation and Fluid Management

Procedures for installing ground loops, including pump modules, flushing, antifreeze, and pressurization.

Open Loop Installation Requirements and Controls

Water source requirements, quality, discharge methods, and system controls for open loops.

Ductwork and System Controls

Ductwork Design and Installation Guidelines

Principles for duct sizing, layout, thermostat placement, and plenum heater installation.

System Operation Modes and Hydronic Temperature Control

Managing system operation via thermostats, BACnet, and hydronic setpoint control.

PC Application Usage and Configuration

PC Application Overview, Interface, and Data Views

Guide to installing, connecting, and navigating the PC application's features.

System Configuration, Calibration, and Parameters

Setting up system parameters, alarms, delays, calibration, and data logging.

Troubleshooting and Repair Procedures

General Troubleshooting, Alarms, and Compressor Issues

Diagnosing common faults related to power, alarms, and the compressor.

Mode-Specific Operation and Component Troubleshooting

Troubleshooting issues in Water Heating, Air Heating, Air Cooling, Fan, EEV, Plenum Heater, and DHW modes.

Startup, Maintenance, and Model Specifics

Startup Procedures and General Maintenance Schedule

Steps for initial unit startup and routine maintenance tasks.

Model Specific Information, Performance, and Electrical Data

Technical specifications, performance tables, and electrical data for TF-series models.

Wiring Diagrams, Dimensions, and Control Board

Wiring Diagrams, Electrical Box Layouts, and Refrigeration Circuits

Visual guides for electrical connections and system components.

Unit Dimensions and GEN2 Control Board Details

Physical dimensions of units and descriptions of the control board's layout and connectors.

Appendices and Warranty Information

Software Installation and Firmware Updates

Instructions for installing PC software and updating the control board's firmware.

Limited Express Residential Warranty Terms

Details the product warranty coverage, exclusions, and claim procedures.

Maritime Geothermal TF Series Specifications

General

Category	Heat Pump
Brand	Maritime Geothermal
Series	TF Series
Refrigerant	R410A
Operating Temperature Range (Heating)	20°F to 120°F
Operating Temperature Range (Cooling)	20°F to 120°F