Gas valve lockout I have a carrier hot surface ignition furnace. My led light is blinking 21 for gas valve lockout. What do I need to do to fix this problem. I have very limited heater knowledge, but ...
...meaning the air blows up), than you can crawl under the furnace through the hole under the furnace. The coil then can be brushed with a scrub brush. this will remove dust and hair. Take care not to ...
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