Rheem Classic 90 Plus gas furnaces are designed for utility rooms, closets, alcoves, or crawl spaces. Replace any broken exterior piping. How to Know the Heater Wattage: A Guide for Homeowners. The key is catching problems before they become a big problem. Above are the common problems that are occurred with your Rheem Classic 90 Plus furnace. Replace the transformer if the current is weak. Inspect the belt, it can crack or get worn down. It might mean that there is a failure to communicate between the control boards. My Rheem furnace has an indicator light that will flash different codes based on what the problem is. Lets take a closer look at the information or details you need about the Rheem Classic 90 Plus Series. These units dont use only flashing LED light sequences, but the furnace can blink a few times with a two-second pause (youll find out what these light codes mean below). Allow the gas in the lines to clear by turning off the gas control switch and wait 5 minutes. There is also a direct spark mechanism ignites the Rheems furnace pilot light, for quick lighting. Classic 90 Plus Warranty Rheem offers a limited lifetime warranty on most furnace models on this Classic 90 Plus series. All Rights Reserved, Rheem Classic 90 Plus Troubleshooting - Common Problems and Solutions, Rheem Classic 90 Plus Furnace - Common Issues, Rheem Classic 90 Plus Furnace Troubleshooting. Immediately unplug the furnace from the power source and remove the control panel. Here is some info about the Rheem Classic 90 Plus: Although the Rheem Classic 90 Plus gas furnace costs a bit more, youll get everything you want for it. Three LED blinks with a two-second pause indicates the limit switch is closed. The issue is it feels like the air coming out of the ducts is not very warm at all, like it's not running at full tilt. February 2017 in Gas Heating. Routine maintenance tasks such as changing the air filters and having furnace services annually can help to keep your furnace running efficiently and prevent premature wear and tear. Rheem classic 90 plus. It stopped working. Rheem Power Vent Water Heater Troubleshooting. Three LED blinks with a two-second pause indicates the limit switch is closed. RheemClassic 90 Plus Parts Order Online! Check if the current arches when it touches one of the contacts.