How Thermador Error Codes Work
Thermador dishwashers are built on the BSH platform (the same engineering family as Bosch and Gaggenau), so they use an “E” fault system: the letter E followed by a two-digit number that identifies the failed or out-of-range subsystem. On the Sapphire, Star Sapphire, Emerald, and Topaz series most common in Orange County kitchens, the code shows on the display or as a blinking light pattern on the older button-only panels.
Because the code language is consistent across the BSH range, the reference below applies whether you have a top-control Sapphire with the third rack or an older Emerald model. What changes between models is the price of the part, not the meaning of the code.
Two things are worth knowing before you act on a code:
- Codes name a system, not always a part. E24 means “drainage blocked.” The cause could be a clogged filter (a five-minute fix) or a failed drain pump (a part replacement). The code is where diagnosis starts, not where it ends.
- Resetting a water code without investigating can cause damage. E15 exists because the machine detected water in the base pan. Clearing the code and running another cycle before you find the leak can turn a small seal failure into water damage under the cabinets.
For Thermador dishwasher repair in Orange County, Universal Appliances Repair carries the common BSH-platform parts and offers same-day diagnosis on most fault codes.
Code-by-Code Reference: E01 Through E25
Control Board / Electronics Fault
What it means: The main control board reported an internal error or lost communication with a monitored component. E01 can show after a power surge or a brownout, both common in older Orange County homes during summer grid strain.
Check first: Switch the dishwasher off at the wall (not just the panel) for two full minutes, then restore power. A genuine transient glitch will clear and not return. Confirm the outlet itself has stable power by testing another appliance on the same circuit.
If it persists: The control board needs testing and, in most cases, replacement. This is the most expensive repair in this guide, so accurate diagnosis matters before condemning the board.
Flow-Through Heater Fault
What it means: The flow-through heater that warms the wash water has failed or is drawing incorrect current. You may notice dishes coming out cold and poorly cleaned, and the StarDry drying result falling off, in the cycles before the code locks the machine.
Check first: There is no safe DIY fix here; the heater is integrated into the sump assembly and carries mains voltage. Note whether dishes have recently been coming out cold, which confirms the heater rather than a transient reading.
Repair: The flow-through heater is a technician replacement. On Thermador models it is a sealed unit combined with the pump housing, which is why the cost runs higher than a simple element swap.
Repair cost: $300–$550. Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
Flow Sensor Fault
What it means: The flow sensor (a small reed switch on the fill path) is not registering the water flow the control board expects. Water may be entering, but the machine cannot confirm how much.
Check first: Turn off the water supply, disconnect the fill hose at the back, and clean the mesh inlet screen where the hose connects. Mineral scale from hard Costa Mesa water frequently slows the flow enough to confuse the sensor. Also confirm the household supply pressure is adequate.
If cleaning does not resolve it: The flow sensor itself has failed and needs a technician to test and replace.
Repair cost: $150–$300. Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
Anti-Flood Triggered: Water in the Base Pan
What it means: A float switch in the base of the dishwasher detected water and activated the anti-flood protection. The machine runs its drain pump continuously and will not start a cycle. A water-tap symbol often shows alongside the code. This is a real leak-detection event, not a sensor glitch.
Do not reset and run. The base pan has water in it because something upstream is leaking. Running another cycle before finding the source risks the exact cabinet and subfloor damage the anti-flood system is designed to prevent.
What to do: Pull the dishwasher forward and tilt it carefully backward to drain the base pan through the front (Thermador dishwashers weigh 55–70 lbs, so get help). Then inspect the door gasket, the hose clamps at the inlet and drain, the sump seal, and the spray arm connections for the leak source.
Repair: Door seal, hose, or sump seal replacement depending on the source. A technician should confirm the leak is fixed before you run the machine again.
Water Inlet Valve Stuck Open
What it means: The machine detected water entering when it should not be, which points to a water inlet valve that has stuck in the open position. Left unchecked, this is one of the faults that can eventually trigger the E15 anti-flood as well.
Check first: Turn off the water supply shutoff valve under the sink to stop any active overfill. This is a containment step, not a fix.
Repair: The inlet valve solenoid has failed and needs replacement by a technician. It is a common wear item and a straightforward repair once the machine is accessed.
Repair cost: $200–$400. Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
Drain Filter Blocked
What it means: The machine detected restricted drainage traced to the filter assembly at the bottom of the tub. This is the most DIY-friendly code in the guide.
Check first: Remove the bottom rack, twist the cylindrical filter counterclockwise, and lift out the whole filter assembly. Rinse every part under running water and clear any debris from the sump opening underneath. Food residue, labels from jars, and grease build up here over months.
If it returns after cleaning: The restriction is further down the drain path (see E24) or the pump is involved. A technician should trace it.
Drainage Blocked
What it means: Water is not leaving the machine. Unlike E22 (filter-specific), E24 points at the broader drain path: the hose, the disposal connection, or the pump.
Check first: Clean the filter as described under E22. Then check the drain hose behind the machine for kinks or crushing. If the dishwasher drains into a garbage disposal, confirm the knockout plug was removed at installation; a plug left in place blocks drainage completely and is a classic cause after a new disposal is fitted.
If the hose and disposal are clear: The drain pump has likely failed or its impeller is jammed by debris. A technician will access the sump to clear or replace it.
Repair cost if pump replacement needed: $250–$450. Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
Drain Pump Blocked or Disconnected
What it means: The drain pump cannot turn freely or the control board is not seeing it. A foreign object in the pump housing (broken glass, a fruit pit, a bone fragment) is the most common mechanical cause.
Check first: With the machine empty and power disconnected, remove the filter and the pump cover at the bottom of the sump. Feel around the impeller for debris and clear anything you find. A single glass shard lodged in the impeller will trigger E25 every cycle.
If the housing is clear: The pump motor has seized or the wiring connection has failed, both of which need a technician.
Repair cost if pump replacement needed: $250–$450. Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
When to Reset vs When to Repair
Not every code means an immediate service call. The table below summarizes what you can reasonably attempt versus what needs a technician for each code in this guide.
| Code | Safe to reset and retest? | DIY check worth trying |
|---|---|---|
| E01 | Once, after a two-minute power cycle | Power off at the wall, confirm outlet power |
| E09 | No; heater fault needs service | None safe; note if dishes run cold |
| E14 | Yes, after cleaning the inlet screen | Clean inlet filter screen, check pressure |
| E15 | No. Do not reset until the leak is found. | Tilt machine to drain base pan, inspect seals |
| E16 | No; close the water supply and call | Shut off water supply to stop overfill |
| E22 | Yes, after cleaning the filter | Remove and rinse the drain filter |
| E24 | Yes, after clearing filter and hose | Clean filter, check hose and disposal plug |
| E25 | Yes, after clearing the pump housing | Check pump impeller for glass or debris |
Our dishwasher repair service in Orange County covers Thermador Sapphire and Emerald series machines across Costa Mesa, Newport Beach, Irvine, and the rest of the county. We stock the most common BSH-platform dishwasher parts to complete most fault-code repairs the same day.
Repair Costs in Orange County
Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
| Fault / Repair | Typical Cost Range | Associated Codes |
|---|---|---|
| Service call / diagnostic: Orange County market average (generally credited toward repair if you proceed) | $95 – $150 | All codes |
| Flow sensor replacement | $150 – $300 | E14 |
| Water inlet valve replacement | $200 – $400 | E16 |
| Drain pump replacement | $250 – $450 | E24, E25 |
| Anti-flood leak repair (seal / hose) | $200 – $450 | E15 |
| Flow-through heater assembly | $300 – $550 | E09 |
| Control board replacement | $400 – $900 | E01 |
For context, a new Thermador Sapphire series dishwasher starts around $1,600 and reaches $2,400 for a top-tier model with the StarDry and third-rack features. Most single-fault repairs stay well under that. Even a flow-through heater replacement at $550 is a fraction of the cost of a new machine, and Thermador dishwashers are built for long service lives, so repair is the sound economic call for nearly every code in this guide.
If you are seeing more than one code in sequence (for example an E22 filter code followed by an E24 drain code), that pattern usually points to long-term debris accumulation that has stressed the whole drain path. A thorough mechanical service during the repair visit clears the filter, hose, and pump together and prevents a second callback.
Thermador Dishwasher Repair Across Orange County
Universal Appliances Repair services Thermador Sapphire and Emerald series dishwashers in Costa Mesa, Newport Beach, Irvine, and throughout Orange County. BSH-platform parts stocked, same-day diagnosis on most fault codes. See our full Thermador service page for what we cover.
Book a Repair VisitFrequently Asked Questions
How do I reset a Thermador dishwasher error code?
Press and hold the Start button for 3 to 5 seconds until the display clears, then close the door and switch the machine off at the wall for one minute. Power it back on and start a short cycle. If the same code appears again within the first few minutes, the fault is confirmed and a reset will not resolve it. Never reset and re-run an E15 anti-flood code; the base pan has water in it for a reason, and running another cycle risks damaging your cabinetry.
What does E15 mean on a Thermador dishwasher?
E15 is the anti-flood fault: a float switch in the base pan has detected water where there should be none, so the machine keeps draining and will not start a cycle. Often you can clear it by tilting the dishwasher back to drain the base pan and letting it dry, but the water arrived from somewhere. Until a technician finds and fixes the leak source, usually a cracked hose, a failed pump seal, or a leaking spray arm connection, E15 will return.
Why is my Thermador dishwasher not draining?
A Thermador that will not drain usually shows E22, E24, or E25. Start with the drain filter at the bottom of the tub: twist it out and clean all the pieces under running water. Then check that the drain hose behind the machine is not kinked and that the garbage disposal knockout plug was removed at installation. If the filter and hose are clear but water still stands in the tub, the drain pump impeller is jammed or the pump has failed and needs a technician.
How much does it cost to repair a Thermador dishwasher in Orange County?
Our diagnostic fee is $99 flat, applied toward the repair if you proceed. Common Thermador repairs range from $150 to $300 for a flow sensor (E14), $200 to $400 for a water inlet valve (E16), $250 to $450 for a drain pump (E24/E25), $300 to $550 for the flow-through heater (E09), and $400 to $900 for a control board (E01). Estimates vary by brand, part availability, and diagnosis. Final quote is provided before repair.
Which Thermador error codes require a technician?
E01 (control board), E09 (flow-through heater), E14 (flow sensor), and E16 (inlet valve stuck open) all require a qualified technician, as does any E15 anti-flood code once the base pan is dry, because the leak source still has to be found. E22, E24, and E25 drain faults are worth a filter cleaning and drain-hose check first; if the code returns after that, the drain pump needs service. Any code that recurs in two consecutive cycles despite a DIY check should be scheduled with a technician.
