A kiln controller runs an electric kiln's firing for you. You choose a cone and speed, or you write your own steps, and the controller heats, holds and cools the kiln to match, then turns it off. This guide explains what a kiln controller does, the two main firing modes, the features worth having, how the main electric kiln temperature controllers compare by maker, what error codes mean and what an upgrade involves. It is research-based: we compare maker manuals and spec pages; we do not fire kilns.
What a kiln controller does
The controller is one part of a small system. Three other parts do the physical work:
- Thermocouple: a temperature probe that pokes into the chamber and sends a small voltage to the controller. See our kiln thermocouple guide.
- Relays: switches that turn the elements on and off many times a firing, on the controller's command. Our kiln relay guide covers them.
- Elements: the coiled wires that make the heat. See kiln elements.
The controller compares the thermocouple reading with where the schedule says the kiln should be at that moment. If the kiln is behind, it keeps the relays on longer; if it is ahead, it switches them off more. Orton describes its AutoFire controllers as using variable PID control, a standard method for holding a target smoothly instead of overshooting.
That is the whole difference from a mechanical kiln sitter, which only turns the kiln off when a small cone bends and leaves the heating rate to you.
Cone fire vs ramp hold
Nearly every pottery kiln controller offers two ways to program a firing.
Cone fire mode
You enter a cone number and a speed, and the controller picks a built-in schedule. Skutt's KilnMaster asks for preheat time, cone value, firing speed and a hold time at peak, then uses what Skutt calls Cone Correlation to adjust the final temperature. Bartlett's V6-CF offers four cone fire speeds (slow bisque, fast bisque, slow glaze, fast glaze). Orton's AutoFire guides list presets from cone 022 to cone 12 with fast, standard and slow speeds.
Cone fire is the right start for most home potters. One caution from Digitalfire: built-in programs are generic and can fire past what a cone shows, so check them with witness cones, as our pyrometric cones guide explains.
Ramp hold mode
Ramp hold (Skutt calls it Ramp/Hold, Orton calls them User Programs) lets you write the schedule as segments. Each segment has three values:
| Field | What it sets | Typical use |
|---|---|---|
| Rate | Degrees per hour, heating or cooling | A slow early climb, a fast middle, a controlled cool |
| Target temperature | The temperature that segment ends at | Peak temperature, or a drop point in a cooling segment |
| Hold | Time to stay at the target | A short hold to smooth glaze, a long hold to dry ware |
Skutt's KilnMaster stores up to 12 programs with up to 32 segments each. Orton's AutoFire 4000 guide lists 35 programs with up to 20 steps each, and Bartlett lists 30 programs of up to 32 segments for its Genesis Mini. For worked schedules, see our cone 6 firing schedule.
Controller features that matter
- Delay start: start a firing later, for example overnight. Orton allows up to 99 hours 59 minutes.
- Preheat or candling: a low-temperature hold that dries ware before the real climb, useful for bisque.
- Controlled cooling: Skutt's optional COOL feature adds a slow cooling ramp to a cone fire program; Orton's COOL option cools at up to 180°F (100°C) per hour down to 392°F (200°C).
- Temperature alarm: a beep at a set temperature, handy for watching the end of a firing.
- Diagnostics: Skutt's KilnMaster runs voltage and amperage tests through a current sensor in the control box. Paragon's Sentinel Smart Touch reads circuit volts and amps during a firing. Falling amps over months usually point to aging elements.
- Firing log and counter: Skutt's touchscreen stores the last 10 firings for download, and the KilnMaster counts firings since elements, relays and thermocouples were changed.
- Vent output: some controllers switch a downdraft vent on and off; Skutt's turns its EnviroLink vent off at 150°F (66°C).
- Multi-zone control: larger kilns may have two or three thermocouples so the controller can even out top and bottom temperatures.
Wi-Fi and phone apps
Newer touchscreens connect to Wi-Fi for software updates and remote monitoring. Skutt's KilnMaster Touchscreen works with a free app that shows temperature and status, plus a paid KilnLink upgrade with more features. Bartlett's Genesis controllers connect to its KilnAid app; Bartlett's own FAQ says you cannot yet program from KilnAid. Evenheat's TAP controllers use an SDS Industries app.
Treat apps as a window, not a remote control. Every maker in this guide says not to leave a firing kiln unattended, and an app does not change that.
Best electric kiln temperature controllers by maker
You rarely buy a controller on its own. It comes with the kiln, so the realistic question is which controller family your kiln brand uses and what each offers. These are the main ones on US pottery kilns in October 2026, from maker pages.
| Controller | Made by | Interface | Programs | Wi-Fi | Found on |
|---|---|---|---|---|---|
| KilnMaster | Skutt | 12-key pad | 12 programs, up to 32 segments | Not built in | Skutt KM kilns |
| KilnMaster Touchscreen | Skutt | Touchscreen | My Programs, library, Guided Start | Built in | Skutt KMT kilns |
| Genesis family | Bartlett | Touchscreen | 30 programs, 32 segments (Genesis Mini, per Bartlett) | Built in, KilnAid app | L&L Easy-Fire, Evenheat Icon+, others; Bartlett also makes Paragon's Sentinel Smart Touch |
| V6-CF | Bartlett | Keypad | Cone fire with four speeds, plus Vary-Fire ramp hold | No | Seattle Pottery Supply and others |
| AutoFire 4000, 4X, Slide | Orton | 12 button, 3 button, touchscreen | 35 programs, 20 steps (4000) | PC monitoring software | Kiln makers and stand-alone systems |
| TAP II | SDS Industries | Large touchscreen | Not listed on the maker page we checked | Built in, SDS app | Evenheat |
| Rampmaster II | Evenheat | Keypad | Ramp hold | No | Evenheat ceramic kilns |
Skutt KilnMaster and KilnMaster Touchscreen
The KilnMaster keypad is one of the most widely documented controllers, with cone fire, ramp hold, delay start, a firing cost calculator and the diagnostics listed above. The touchscreen version adds graphs, a program library, Guided Start for beginners and built-in Wi-Fi. Skutt publishes upgrade instructions for fitting a touchscreen to an existing kiln. More on Skutt models in our Skutt kilns review.
Bartlett Genesis and V6-CF
Bartlett supplies controllers to many kiln makers rather than selling complete kilns. The Genesis touchscreens show a firing graph, store custom programs, update over Wi-Fi and run diagnostics with a current sensor. The V6-CF is the keypad workhorse.
Bartlett's own pages disagree on the Genesis Mini. One Bartlett product page says it has been discontinued in favor of the Genesis 2.0; another still offers it for direct order. Program counts also vary by source: Bartlett lists 30 programs for the Genesis Mini, while a Sheffield Pottery listing quoted in our Paragon review says 12. Ask the kiln dealer which Genesis version ships.
Orton AutoFire
Orton sells its controllers as panels for kiln makers and as complete stand-alone systems for upgrading manual kilns. Many Paragon kilns use Orton-made Sentry controllers; see our Paragon kilns review.
Evenheat TAP and Rampmaster
Evenheat offers the SDS TAP touchscreens, Bartlett-based Icon models and the keypad Rampmaster II on its pottery kilns. Our Evenheat kilns review lists which kilns get which.
How to choose: what to look for when buying a kiln
A keypad controller fires as well as a touchscreen; the screen changes how easy programming is, not the result. Look at these points instead:
- Cone fire with adjustable speed and hold. Covers most bisque and glaze work.
- Enough ramp hold segments for slow cooling or drop-and-hold glaze schedules if you plan to try them.
- Diagnostics with amp readings, which show element wear before firings fail.
- Multi-zone control on kilns deeper than about 23 inches, where top and bottom can differ.
- Local support. A dealer who stocks the maker's thermocouples, relays and boards matters more than app features.
Replacing or upgrading a controller
There are two kinds of upgrade. A replacement board swaps one controller for a newer one in the same control box; Bartlett, for example, says its Genesis Mini directly replaces the Orton AutoFire Express and Sentry Xpress, while other 3-key models need control box changes. A stand-alone controller box is a separate unit with its own relays that the kiln plugs into, used to add digital control to a manual kiln. A board alone cannot convert a manual kiln; one dealer listing for the Genesis Spark board says so directly.
A stand-alone box is a real expense: Seattle Pottery Supply's Bartlett-based box listed in roughly the $1,400 to $1,800 band in October 2026 (the page showed two different figures); check the live price. Converting a kiln with a mechanical sitter has its own steps, covered on our kiln sitter page.
Have controller retrofits done by the kiln maker, a qualified kiln technician or a licensed electrician. Do not open a control box while the kiln is plugged in or the breaker is on. Digitalfire notes that home-built controllers are not CSA or UL listed, which can affect fire insurance.
Error codes: what the common ones mean
Codes differ by brand, so the manual is the final word. These are the ones home potters see most:
| Code | Controller | Maker's meaning | Usual suspects |
|---|---|---|---|
| FAIL | Skutt, Orton, Bartlett | Thermocouple circuit broken or failed | Thermocouple or its connections |
| E-1 | Skutt KilnMaster | Kiln climbing slower than 12°F per hour for 22.5 minutes | Broken element, burned-out relay, low voltage, firing past the kiln's rating |
| E-3 | Skutt KilnMaster | Kiln 50°F below a hold temperature | Worn or broken elements, relay, low voltage |
| FTH | Orton AutoFire | Fail to heat | Elements, relays, supply |
| TCR | Orton AutoFire | Thermocouple polarity reversed | Lead wires swapped |
| PF | Orton AutoFire | Power interruption | Outage or tripped breaker |
Skutt notes that its E-1, E-3 and E-5 codes only appear when error codes are turned on. An error that points to the supply, such as low voltage, is a job for a licensed electrician.
Common kiln controller mistakes
- Trusting the display without witness cones. Thermocouples drift and the screen cannot show it.
- Typing a rate or target in the wrong units, such as Celsius on a Fahrenheit controller.
- Using the fastest cone fire speed for thick or damp ware.
- Ignoring slow-firing errors until elements fail mid-glaze.
- Leaving the kiln unattended because an app is watching it.
Safety notes
Orton's guides state that a controller is not a safety device and that relays can fail in the "on" position, so be present near the end of every firing. Keep the clearances in your kiln manual, vent the room and keep combustibles away. Clean studio dust with a damp cloth or HEPA vacuum, not by dry sweeping, since clay and glaze dust contain silica.
What you need
A controller comes with the kiln, so the main purchase is the kiln itself plus a box of witness cones to check it. Compare controller-equipped models in our best kilns for home pottery guide.
Sources: Skutt KilnMaster and KilnMaster Touchscreen pages; Skutt service training manual error code list (dealer-hosted copy); Bartlett Instruments Genesis Mini pages and kiln FAQ; KilnStar Genesis Spark listing at The Ceramic Shop; Orton AutoFire controllers page and AutoFire 4000 and AF4X user guides (October 2018); Seattle Pottery Supply Modular Digital Control Box listing; Paragon and Evenheat controller pages as summarized in our brand reviews; Digitalfire glossary entry on kiln controllers. Specs checked October 2026.