Error code E:09 on a Thermador dishwasher indicates a heating fault: cycles run and finish, but the water never gets hot, dishes come out wet, and the code keeps coming back. The code alone does not name the failed part. Confirming a heating fault means testing the component, and a technician can measure the heat pump’s electrical resistance against its healthy range for an objective answer, then verify with the machine’s own Customer Service Program. When the reading is out of range and the test cycle fails at the heating step, the diagnosis is confirmed by three independent signals. On this Edmond dishwasher that meant a failed wash and heat pump, replaced and proven with a full test run. Here is how the two-visit repair unfolded, including the 30-day estimate in the middle of it.
Job at a Glance
- Appliance: Thermador DWHD440MFP dishwasher
- Location: Edmond, OK
- Symptom: error code E:09, not heating, dishes not drying
- Cause: failed heat pump, confirmed by an out-of-range 0.69 ohm resistance reading
- Repair: new wash and heat pump installed, verified with a full Customer Service Program run
- Also caught: a water distributor assembly leak found during testing, repair approved on the spot
Issue: Error Code E:09 and No Heat
An Edmond customer called about exactly that on their Thermador DWHD440MFP, and Kevin was at the home the next day. On arrival the unit was plugged in, empty, and already showing E:09. Placed into Customer Service Mode, the machine had stored E:09, a heating fault, and no other codes.
Cause: A Failed Heat Pump, Confirmed by Measurement
Kevin removed the front door panel and its cover to reach the components, and cleaned away buildup he found around the float switch area while he was in there. Then came the measurement that mattered: the heat pump tested at 0.69 ohms of resistance, an out-of-range reading for a healthy component. To verify, he ran the machine’s Customer Service Program, and the unit displayed E:09 again at step 10, during the heating portion of the test. The code, the resistance reading, and the test cycle all pointed at the same failed part.
Kevin showed the customer what he found and left a written repair estimate. The customer chose to think it over, which is a decision we respect: the estimate holds for 30 days, and there is no additional trip fee if the repair goes ahead within that window. A few days later the office got the call: go ahead with the repair.
Solution: A New Heat Pump, Installed and Proven
Kevin returned with the part, uninstalled the dishwasher, removed the failed wash and heat pump, and installed the new one. The unit powered up, and he ran the full Customer Service Program to prove the repair rather than assume it: the dishwasher completed the test as designed, heating included.
The test run also earned its keep a second way. During testing, Kevin spotted water leaking from the water distributor assembly, a separate issue from the heating fault. He showed the customer, updated the estimate on the spot, and the customer approved the additional repair; the replacement part was ordered, and the job record closed out the following week. Every part we install is backed by a one-year warranty on parts and labor.
Another Job Done Right
This is what the 30-day estimate is for. The price Kevin quoted at the first visit is the price the customer paid when they decided to move forward, with no second trip fee for taking the time to decide. And because the repair was proven with a full test cycle instead of a handshake, a second problem got caught while the technician was still standing in the kitchen.
If your Thermador dishwasher is showing E:09, not heating, or not drying in Edmond or anywhere in the Oklahoma City metro, call us at (405) 813-4923, or read more about our Thermador service and dishwasher repair.
