Thermador HPCN36WS Instructions for Use - Page 17

Service Troubleshooting Use the suggestions in the table below before calling for service to avoid service charges. Problem Suggested cause and solution Noise during operation Some noise is normal due to vibration and air movement. • Excessive noise could indicate one of the following: -- ductwork is too small / undersized -- ductwork is too large / oversized -- ductwork is loose -- transition is too small or is loose -- wood screws are not fully tightened -- loose screws in trim parts, etc. Check installation manual to verify that ductwork is the proper size. Tighten screws. Noise when unit is off • Backflow flap on outside of duct wall cap moves with the wind. This is normal. Lights and fan blower do not work • Hood circuit breaker may be tripped. Reset breaker. Fan blower does not work • Power supply is insufficient. • Electrical wiring is incorrectly connected. See the installation manual for more information. Hood trips breaker • Electrical wiring is incorrectly connected. • Circuit is not sufficient. See the installation manual for more information. The hood is not venting properly • • The hood may be too high from the cook top. The hood may not be centered above the cook top. Make up air not sufficient. The wind from opened windows or opened doors in the surrounding area is affecting the ventilation of the hood. Close all the windows and doors to eliminate the outside air flow. Blockage in the duct opening or ductwork. Remove all blockage from the ductwork or duct opening. Duct length too long, too many elbows, "back to back" elbows, or too small roof or wall cap, will all cause issues with air draw. See the installation manual for more information. Fault tone • Two short beeps will sound whenever the pressing of a button by the user results in a possible function that is not possible by the system. The beep tone can be disabled by pressing the FILTER and LIGHTS buttons simultaneously for at least 3 seconds. Pressing the FILTER and LIGHTS buttons simultaneously when the beep sound is turned off will turn on the beep sound. Page. 15