Toshiba HWT-601F21SM3W-E

Questions and Answers

K
Kelly VegaAug 18, 2025
Why is my Toshiba HWT-601F21SM3W-E not heating or cooling properly?
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  David YoungAug 18, 2025
  If your Toshiba Heat Pump isn't heating or cooling the room adequately, or the water isn't hot enough, start by checking the remote controller's operation and temperature settings to ensure they are correct. Also, verify the function code setting using the function code table. Inspect the backup heater and bimetal thermostat. Confirm that the equipment capacity is sufficient for your needs. Finally, check that the temperature sensor is correctly positioned.
M
Michael HunterAug 20, 2025
How to fix a blank remote controller screen on my Toshiba Heat Pump?
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  Sharon PerezAug 20, 2025
  If nothing is displayed on the remote controller of your Toshiba Heat Pump, first check the power supply wiring to ensure it's properly connected. If the power supply is okay, check the settings using the DN codes.
D
David JonesAug 23, 2025
How to troubleshoot F23 error on Toshiba Heat Pump?
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  george85Aug 23, 2025
  To address the F23 error (Low pressure sensor error) on your Toshiba Heat Pump: * Check the connection (body or connection wiring) of the low pressure sensor. * Check the resistance value of the low pressure sensor.
E
Edward KellyAug 26, 2025
How do I fix the F14 error on my Toshiba HWT-601F21SM3W-E Heat Pump?
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  webbjoshuaAug 26, 2025
  To fix the F14 error (TTW sensor error) on your Toshiba Heat Pump, check the resistance value and connection of the hot water cylinder sensor (TTW).
C
cwilliamsAug 28, 2025
How do I troubleshoot the F10 error on my Toshiba HWT-601F21SM3W-E?
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  ann49Aug 28, 2025
  To address the F10 error (TWI sensor error) on your Toshiba Heat Pump, check the resistance value and connection of the water inlet temperature sensor (TWI).
D
David BrewerAug 30, 2025
What to do if my Toshiba Heat Pump has low water flow and error code A01?
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  tjacksonAug 31, 2025
  If you're experiencing almost no or little water flow and see error code [A01] on your Toshiba Heat Pump, the following steps may help: * Release any trapped air from the pump completely. * Adjust the hydraulic pressure, considering the pipe height, and add water until the manometer displays the correct value or higher. * Clean the strainer to remove any blockages. * Widen the water path to the Hydro Unit or install a bypass valve to reduce resistance. * Check the wiring and components of the motorized 3-way valve for hot water supply.
R
Rachel FloresSep 2, 2025
Why is hot water leaking from my Toshiba HWT-601F21SM3W-E Heat Pump's overpressure valve?
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  Jeffrey ThompsonSep 2, 2025
  If hot water is leaking from the overpressure preventive valve of your Toshiba Heat Pump, it could be due to excessive hydraulic pressure. Adjust the hydraulic pressure, considering the pipe height, and replenish water until the manometer shows a value of set hydraulic pressure or more. Also, check if the expansion tank capacity is sufficient for the total water amount; if not, install another expansion tank. Finally, verify the air pressure in the expansion tank.
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Meghan AustinSep 4, 2025
What does E04 error mean on my Toshiba Heat Pump?
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  Mckenzie AllenSep 5, 2025
  If your Toshiba Heat Pump displays error code E04, indicating a communication error between the Hydro Unit and Outdoor Unit, check the serial circuit for miswiring.
U
uschultzSep 7, 2025
How to unlock the pump on my Toshiba HWT-601F21SM3W-E with error A14?
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  Michael MorenoSep 7, 2025
  If your Toshiba Heat Pump's pump is locked and displaying error code [A14], it may be due to dust clogging the pump. To unlock it, insert a Phillips screwdriver into the hole and turn it left or right.
D
Dave YoungSep 10, 2025
What does E03 error mean on my Toshiba HWT-601F21SM3W-E?
- K
  Kayla WebbSep 10, 2025
  If your Toshiba Heat Pump displays error code E03, indicating a communication error between the Hydro Unit and the remote controller, check the remote controller connection.

Summary

General Information

System Combination

Details the compatibility of Hydro Unit with various Outdoor Units and backup heaters.

General Specifications

Lists key technical specifications for Outdoor Units, including power, capacity, and dimensions.

Accessory Parts

Precautions for Safety

General Safety Precautions

Emphasizes following regulations, reading manuals, and performing test runs for safe installation.

Refrigerant Precautions

Warns about potential toxic gas generation from refrigerant leaks near heat sources.

Main Components of Hydro Unit

Exploded View and Description

Provides an illustrated breakdown and identification of the Hydro Unit's internal components.

Hydro Unit Installation

Positioning

Guides on selecting an appropriate installation location, considering weight and service access.

Group Control and Optional Controllers

Group Control Operation

Explains how to connect and configure multiple Hydro Units for group operation and address setup.

Start Up and Configuration

Names and Functions of Parts

Details the buttons on the remote controller and their respective functions for operation and settings.

Settings by Purpose

Settings When Hot Water Supply Function is Not Used

Instructions on setting DN "6B8" to "1" when the hot water supply function is not utilized.

Setting for Cooling

Guidance on installing a motorized 2-way valve for cooling and connecting its cables to the Hydro Unit.

Settings for Hot Water Supply

Steps for preparing the hot water cylinder, connecting a 3-way valve, and setting DN "6B8" to "0".

Settings for 2-Zone Temperature Control

Instructions for procuring and connecting a mixing valve and temperature sensor for 2-zone control.

Setting for Second Remote Controller

Steps for connecting a second remote controller to the Hydro Unit via TB04 terminals.

Maintenance

Troubleshooting

Technical Parameters

Technical Parameters for Heat Pump Combination Heater

Detailed technical specifications and performance data for heat pump combination heaters.

Toshiba HWT-601F21SM3W-E Specifications

General

Cooling Capacity (kW)	6.0
Heating Capacity (kW)	7.0
Power Input (Heating)	1.75 kW
COP	4.00
Power Supply	220-240V, 50Hz
Noise Level (Outdoor Unit)	52 dB
Operating Temperature Range (Heating)	-15 to 24 °C
Operating Temperature Range (Cooling)	10°C to 46°C