The short answer
The Daikin One Touch is a touch-screen thermostat built to talk to Daikin’s communicating furnaces, air handlers and heat pumps. In Northern Virginia homes, when it says “Communication error,” it lost contact with a piece of that equipment or had an internal fault, and the code in its error history tells you which. For lost contact, Daikin’s list is short: the two data wires reversed, a blown fuse or tripped breaker, or a loose or broken wire. Restart it first. If the alert comes back, write the code down and call. A visit starts with a $99 diagnostic.
What the One Touch is
Model DTST-TOU-A. Daikin brought it out to join the Daikin One+ as a control for its communicating systems, including Daikin FIT. It isn’t wired like a regular thermostat. It uses four wires, marked 1, 2, C and R, runs up to 125 feet of 18 gauge wire, and gets its power from the indoor unit. Daikin lists three setups it runs:
- A Daikin communicating furnace, air handler or coil with a communicating outdoor unit.
- A Daikin communicating indoor unit with a regular single-stage condenser.
- A gas furnace of any make through Daikin’s D24V Gateway, with a Daikin FIT outdoor unit or coil. That’s in the D24V Gateway flyer.
It also runs Daikin ductless units through an adaptor. From Daikin’s One Touch product flyer, One Touch spec sheet and One Touch dealer training module.
The $67 Heating Check
We check your furnace, heat pump or boiler before winter. Through December 31. See the offer
One Touch or One+?
Same family, same alert codes. The One+ adds remote temperature sensors and a sound setting the One Touch doesn’t have. The One Touch has four screens: home, schedule, away and air quality. It works with the SkyportHome app on iPhone and Android, and with Alexa and Google. If yours is a One+, our Daikin One+ alerts guide has its menus.
What the alert codes mean
Alerts outrank every other message on the screen, and when one comes up, your dealer’s contact info shows on the home screen. Past alerts are in the error history with the date, time, code and equipment: white for minor, yellow for critical. Daikin’s code list for it is one shared table, linked from the One Touch’s own product page.
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| Code | What Daikin’s table calls it | How serious |
|---|---|---|
| 03 | Thermostat internal communication error | Critical |
| 04 | Thermostat software upgrade error | Critical |
| 05 | Communication errors | Minor |
| 0B, 0C, 0D | Temperature or humidity sensor failure in the thermostat | Critical |
| 0E, 0F | Wi-Fi hardware error | Minor |
| 10 | The thermostat rebooted: power loss, an update or a manual restart | Minor. No action needed |
| 1E | Lost contact with the heat pump | Critical |
| 1F | Lost contact with the air conditioner | Critical |
| 20 | Lost contact with the EEV coil (an indoor coil with an electronic valve) | Critical |
| 21 | Lost contact with the air handler | Critical |
| 22 | Lost contact with the furnace | Critical |
For every lost-contact code, 1E through 22, Daikin gives the same three checks: the polarity of the Data1 and Data2 wires, a blown fuse or tripped breaker, and loose, shorted or broken wires. The screen says “Communication error” for all of them, so the code in the history is what tells you which piece of equipment dropped off. For 03 and 04, Daikin’s steps are a restart and a check of the 24 volt power to the thermostat.
Daikin’s printed table is partial. If the history shows a code that isn’t on it, don’t guess: write it down and call. E11 is different. It’s the system test notice, and Daikin says the test is complete only when it clears. If it’s still there after an install, the installer needs to finish the test.
From Daikin’s Daikin One error code list and One Touch dealer training module.
How to restart it
Tap the menu icon at the top left of the home screen, then settings, thermostat, restart thermostat. Daikin’s table calls this a warm start. A code 10 in the history afterward is just that restart.
A factory reset is a different thing. It sits in the setup options on the welcome screen, and Daikin doesn’t print owner steps for it. A reset puts the thermostat back the way it left the factory, so the equipment setup has to be done again. Leave that one to us.
Wi-Fi and the app
- Connect: menu icon, settings, Wi-Fi, check use Wi-Fi, pick your network and enter the password.
- Pair the SkyportHome app: settings, then Account, to get a code. The code expires after 15 minutes, and you can get a new one.
- Your router: it needs a password. A 5 GHz router works if it also runs 2.4 GHz.
Codes 0E and 0F are the thermostat’s own Wi-Fi hardware, and Daikin rates them minor. If rejoining the network doesn’t clear them, call. Steps from the One Touch homeowner guide.
A blank screen
The One Touch runs on power from the indoor unit, so a blank screen starts there: the furnace or air handler switch, its breaker, or a blown fuse. Daikin’s own steps stop at checking the 24 volt power and a restart. One more thing to rule out: night mode turns off the display and light bar on a schedule, so a dark screen at night may be doing what it was set to do.
The warranty
Up to 5 years as it comes. Register it online within 60 days of the install, on a home you own and live in, and it’s up to 12 years. Either way, Daikin replaces the control only and doesn’t pay labor. A One Touch bought online or by phone isn’t covered unless a dealer installs it. All from the Daikin ONE controls warranty.
When to call
- A communication error that comes back after a restart.
- Any yellow, critical alert.
- A blank screen with the indoor unit’s switch and breaker on.
- A code that isn’t in Daikin’s table.
Don’t swap the data wires or open the equipment yourself. The panels hide high voltage that stays live after the system stops.
What it costs
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| Cause | How you’d know | What fixing it costs |
|---|---|---|
| A tripped breaker or switch at the indoor unit | Blank screen, or every piece of equipment lost at once | Nothing if it’s a breaker |
| A loose or reversed data wire | 1E to 22 after a power outage, a remodel or a thermostat swap | Priced in writing before any work starts |
| A failed equipment board | The same lost-contact code with good wiring | $550 to $1,180 for a new board |
| The thermostat itself | 0B, 0C or 0D, or an 03 that keeps coming back | $300 to $640 to replace it |
The tech reads the error history, checks the data wires end to end and the 24 volt supply at the indoor unit, and gives you the price in writing before any work starts. Other thermostat problems are in our thermostat guide. Our heating check is $67 per system through December 31, for a furnace, heat pump or boiler.
We fix Daikin furnaces, heat pumps and air handlers across Northern Virginia, in Ashburn, Leesburg, Sterling, Herndon, Chantilly, Fairfax, Arlington and Manassas.
More Daikin: Daikin mini split error codes; a blinking green light on a Daikin mini split; Daikin One thermostat alerts; Daikin mini split troubleshooting. Daikin owns Goodman and Amana, so their furnace codes are in our Goodman furnace codes chart, and other brands are in our error codes and warning lights guide.
Get it fixed
Call (703) 997-9757 and we’ll get a tech out to look at your Daikin system. We answer day or night. Rather book online? Pick a time here and a box of warm cookies comes with the visit. A repair visit starts with our $99 diagnostic, and you get the price in writing before any work starts. Already have a quote? We’ll give you a free second opinion. Rated 5.0 stars across 1,138 reviews on Google, Angi, Yelp, the BBB and Facebook, Virginia Class A license 2705192276.
Questions people ask
What does communication error mean on a Daikin One Touch?
It lost contact with a piece of equipment or had an internal fault. The code in the error history says which. For lost contact, Daikin’s checks are the Data1 and Data2 wire polarity, fuses and breakers, and loose or broken wires.
How do I restart a Daikin One Touch thermostat?
Tap the menu icon at the top left, then settings, thermostat, restart thermostat. If the alert comes back, write the code down and call.
Why is my Daikin One Touch screen blank?
It gets its power from the indoor unit, so check that unit’s switch and breaker first. Night mode also turns the screen off on a schedule. If it’s neither, a tech needs to check the 24 volt supply.
What systems does the Daikin One Touch work with?
Daikin’s communicating systems, including Daikin FIT. It can also run a gas furnace of any make through Daikin’s D24V Gateway, and Daikin ductless units through an adaptor.
How long is the Daikin One Touch warranty?
Up to 5 years, or up to 12 years if you register it online within 60 days on a home you own and live in. It covers the control, not the labor.
