Thermador error code · E5
Thermador Induction E5: Supply Voltage / Power Fault
Thermador induction E5 (power fault) means supply voltage is out of range or wiring is faulty. The cooktop disables heating until voltage is restored.
On Thermador induction cooktops, a power-class code such as E5 means the supply voltage is out of the acceptable range, often a miswired or single-leg 240-volt feed, a loose connection, or a brownout. The cooktop disables heating to protect its electronics until proper voltage is restored, and the exact code character varies by model and should be confirmed against the manual.
What E5 indicates
Thermador induction cooktops need a correctly wired, in-range power supply, typically 240 volts split across two legs. The control measures incoming voltage and will report a power fault if a leg is missing, the voltage is too high or too low, or the connection is intermittent. With this code the cooktop will not run the elements because operating on bad voltage could damage the induction generator. Because code schemes differ across induction generations, the exact character must be confirmed against the model and manual.
What causes E5
The most frequent root after a new install or service is a wiring error such as only one hot leg landed, a swapped or loose neutral, or a marginal connection at the junction box or breaker. Brownouts, an overloaded or partially tripped double-pole breaker, and undersized or backed-out conductors also cause out-of-range readings. Internally, a failed power-input stage can mimic this.
Likely causes
- Miswired supply such as a missing or single 240-volt leg
- Loose or corroded connection at the junction box, breaker, or terminal block
- Low supply voltage or brownout condition
- Partially tripped or failing double-pole breaker
- Failed power-input stage inside the induction generator
Symptoms you may notice
- A power or voltage code appears and the cooktop will not heat
- Code shows immediately after installation or an electrical change
- Some or all zones are dead while the display still lights
- Cooktop works intermittently or only at reduced power
- Breaker is partially tripped or one half feels different
Parts typically replaced for E5
- Supply wiring / terminal block connection — Repaired or corrected when a leg is missing, loose, or miswired
- Double-pole breaker — Replaced when one half is failing or will not stay set
- Induction generator / power board — Replaced if the cooktop's power-input stage has failed with confirmed-good supply
Owner-safe checks for E5
- Switch the cooktop's double-pole breaker fully off and back on, ensuring both halves seat firmly
- Confirm no other large appliance just tripped or browned out the circuit
- If the code started right after installation or electrical work, have the wiring rechecked before retrying
- Note whether the whole cooktop or only some zones are dead, which helps the technician
When to call a technician
Verifying supply voltage on each leg, checking the breaker and terminal-block connections, and distinguishing a wiring or supply problem from a failed internal power stage requires line-voltage measurement at the panel and behind the cooktop, which a technician or electrician should perform.
Frequently asked
Thermador E5: people also ask
What does a power code like E5 mean on Thermador induction?
It means the supply voltage is out of the acceptable range or the cooktop is miswired, so the control disables heating to protect its electronics. It often follows installation or an electrical change.
Why did E5 appear right after installation?
The most common cause is a wiring error, such as only one 240-volt leg landed, a loose terminal, or a swapped neutral. The supply wiring should be rechecked by a technician or electrician before the cooktop is used.
How do I reset a Thermador induction power fault?
Turn the double-pole breaker fully off and back on, making sure both halves seat. If the code returns, the supply voltage or wiring is the problem, not a glitch, and it needs to be measured.
Is it safe to keep trying the cooktop with this code?
No. Running induction electronics on out-of-range or single-leg voltage can damage the generator. Leave the cooktop off until the supply is verified and corrected.
Could a brownout or breaker cause this code?
Yes. Low utility voltage, an overloaded circuit, or a double-pole breaker with one failing half can all push the reading out of range and trigger the fault, even if the cooktop itself is fine.
Do you handle both the wiring check and the cooktop?
Our flat $89 diagnostic measures voltage at the cooktop and traces whether the fault is supply-side or internal. Wiring corrections and generator replacements are warranted for 365 days. Call (650) 668-1554.
Subzero Repair · Open 24/7 · 365-day warranty
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