79.9k 5 5 gold badges 93 93 silver badges 210 210 bronze badges. Show Less. Any ideas? Although a blocked gas line is one reason why the pilot light on a Rheem water heater won't light or stay lit, there are other reasons as well--some easier to correct than others. I cycled the power switch to the power vent off and on and the unit lit. report. The furnace goes through this cycle 3 times, then stops altogether. Thread starter pierce; Start date Sep 9, 2008; Tags 21v40-7 pilot light rheem water heater P. pierce Premium Member. So here are the reasons: If the pilot line is clogged, clean it or replace it. Satisfied Customers: 24,499. Then the pilot won't light again unless I wait a long time before trying again. Turn on your hot water tap and wait for about 4 -5 minutes for the burner to ignite. What happens: Inducer fan turns on and stays on. Rheem water heater- pilot light will not stay lit after having been turned off to install new water filter system. This means it can be a nightmare when your water heater pilot light won’t stay lit. save. She bought it March 03. With a r65rr control. I have good water flow through the heat exchanger. My in laws have a Rheem 21V40-38 and the pilot light will not stay lit. I also dont have a very good spark. If your water heater’s burner is defective, then this is likely to affect ignition, which may cause the pilot’s light to go off. Here are the top five reasons your pilot won’t stay on, as well as methods to fix each issue. The igniter glows, the burner lites, but will occasionally turn off after about 5 seconds. If you have a natural gas or propane water heater and have opened your hot water faucet to find that there’s no hot water, the usual culprit is the pilot light going out. It … Question by wingnut510: The pilot light on my water heater is lit but the burner does not light. The unit was purchased and installed on 6/6/2000. Turn the thermostat up and listen for the furnace to start. Answered in 4 minutes by: 3/18/2014. Viewed 6k times 1. Begin by checking that your furnace is working. Gas and Oil Home Heating Furnaces - Rheem Classic 90 Furnace - Won't Stay Lit - HELP - I have been doing some research on the net, and also here on this forum. hide. If no warm air or only a little warm air is coming from the vents in your home. Water heater burner won't stay lit. Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, … Low and behold, the pilot stayed lit, and I was able to turn the water heater on, and again, I set it to 120 deg. 9,168 Posts #21 • Jan 13, 2013 (Edited) mike356 said: I came across this thread via Google, and found it very helpful. My Rheem Criterion II won't keep the burners lit. Heater is less than 3months old. Granted, a very few rare occassion but I have encountered it. Would appreiate any suggestions for troubleshooting. Twice. A reason this can happen is the pilot shut off does not shut down when the burners safety does. With a full line of Rheem ® tank and tankless water heaters to choose from, there’s sure to be one that’s the right fit for your family. One of the reasons why there is no hot water is when the burner did not ignite, and this is happening when the pilot light does not light. Turn the pilot dial (Dial on the top) to the pilot setting. After I light the pilot, I switch on the gas and it lights -- and then goes out almost immediately. Both times, the water got high enough to douse the … Share this conversation . I held the knob thing down, clicked the ignite button, and the flame came right on, but the status light won't flash and I don't know what's wrong. These numbers seem to be ok per Rheem. Ask Your Own HVAC Question. New thermocouple didn't fix the issue. Over my years servicing water heaters, there have been a few occassions where the pilot will remain on but the burner fails to light. 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