If the muffle and thermocouple pass testing, check the SSR on the main power board. The SSR acts as an electronic switch to route high-current power to the muffle. If it fails in the "open" position, the furnace will never heat. Look for visual signs of scorching or use your multimeter to check for input DC voltage from the control board during a firing cycle. 3. Fixing Display Flickering and Unresponsive Buttons

Muffle Type: High-quality heating coil with quartz glass protection. Programs: 99 programmable slots. Display: Digital LED.

To ensure the furnace is correctly installed in a fixed position, you must securely mount the control unit (S) into the furnace base. Here is the exact process described in the original manual:

: This error appears if the pre-set vacuum switch-off value exceeds the pre-set temperature (

Power On: Use the main switch located at the rear or side of the base.

Open the furnace head. Clean the main rubber O-ring seal on the firing table using a lint-free cloth moistened with alcohol. Inspect for cracks or flat spots.

This guide gives practical, commonly used fixed-restoration program templates and programming steps for the Ivoclar Programat P90. Always verify and prioritize the firing recommendations provided by the ceramic material manufacturer and the official Programat P90 manual for precise, warranty-compliant procedures.

) indicates a cracked, open-circuit muffle that requires total replacement.

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