JennAir Flush Mount Code E:30: internal error from overvoltage

What E:30 means

On the JennAir Flush Mount dishwasher for European cabinets, model JDB9600AW, E:30 is an internal error that switches the appliance off. The reason given is overvoltage, above 290 V, and not a failing part in the dishwasher. The control shuts down to protect itself. Owners see E:30 and the dishwasher powers down, possibly without finishing the cycle. No part of the dishwasher is named as the cause, so the house supply is the first thing to check.

Common causes of E:30

Supply voltage is too high
Problem with the home electrical service
Voltage surge on the circuit

✓ One safe check you can try

1. Turn off the breaker for the dishwasher and leave it off. 2. Check whether other appliances or lights show odd behavior, such as bright flickering. 3. Call an electrician to measure the supply. 4. Do not keep restarting the dishwasher. 5. Once the supply is confirmed normal, call us if E:30 persists.

! Why to stop there

High supply voltage can damage electronics in many appliances at once.
Only a meter and a qualified person can safely measure the circuit.
Repairs inside the dishwasher will not fix the supply.
We quote the price in writing and give 30 days of warranty on our work.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Dishwasher codes

F8E4JennAir Dishwasher Code F8E4: Check for water and leaks after installation F8E5JennAir Dishwasher Code F8E5: Fill valve stuck open F9E1JennAir Dishwasher Code F9E1: Long drain time F9E2JennAir Dishwasher Code F9E2: Drain motor error FAE4 or F10E4JennAir Dishwasher Code FAE4 or F10E4: Diverter valve error FAE5 or F10E5JennAir Dishwasher Code FAE5 or F10E5: Diverter leak H2OJennAir Dishwasher Code H2O: Not detecting water Sanitize Light FlashingJennAir Dishwasher Message "Sanitize Light Flashing": Sanitize Temperature Not Met

E:30E:30 questions

Is E:30 dangerous for my other appliances?

Overvoltage can harm any electronics on the circuit. Stop using the dishwasher, and ask an electrician to check the supply. It is worth testing soon.

Does E:30 mean the dishwasher needs a new board?

The message says no appliance problem is indicated. A surge may still have stressed parts, so after the supply is normal we check whether the dishwasher runs correctly.

Why is E:30 treated as higher priority than E:27?

Overvoltage can burn out electronics, while undervoltage mainly stops operation. Both point to the house supply, but a high reading carries more risk to every appliance on that circuit, so we suggest an electrician check it promptly.