Nur HVAC was called to repair a furnace in San Jose, CA, that had stopped heating because its pilot light was out. After inspecting the system, our technicians traced the fault to a defective safety limit switch and replaced it to return the furnace to safe operation.
The safety limit switch is a protective device that shuts the furnace down if it senses unsafe temperatures, helping prevent overheating. It is an important part of the furnace’s safety chain, so when the switch fails the furnace is designed to stop rather than run in an unsafe state. That can leave the pilot light off and the home without heat, even when nothing else is wrong with the unit. Replacing the faulty switch restores both the safety function and normal ignition, so the furnace can run and shut off exactly as intended.
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What our technicians did
- Problem diagnosis: identified that the pilot light was off and traced it to a failed safety limit switch.
- Safety limit switch replacement: removed the defective switch and installed a new one to restore the furnace’s safety shutoff and ignition.
- Operation check: confirmed the furnace lit and ran correctly after the replacement.
With the new safety limit switch installed, the furnace returned to reliable, safe heating. On every service call, Nur HVAC diagnoses the underlying cause before replacing any part, so the repair addresses the real problem rather than just the symptoms.
Pilot light out? It may not be the pilot
As this job shows, a pilot that will not stay lit is sometimes a symptom of a different failed component rather than a problem with the pilot assembly itself. That is why guessing at parts rarely works with furnaces. If yours has stopped heating, our furnace repair team can pinpoint the actual fault and fix it safely. It is also a good reminder of why safety components should never be bypassed: they exist to shut the system down before a small issue becomes a dangerous one, and a proper repair keeps that protection intact.
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Reviews
Trusted by your neighbors
“We are so glad that we made the right choice for working with Nur HVAC on adding heat pump AC with our existing furnace. The sales representative Ilias was very prompt in responding all our questions and offered a very reasonable price. Fedor and Shalai, the installation team, installed all the new facilities PERFECTLY. They really know their job - all their tasks were super organized and clean - they even cleaned all working spaces every day before they left! (Big Kudos!!) In addition to the quality installation, they also explained how the system works clearly and patiently. We are waiting for inspection now but we believe it will pass thanks to the great work. Thanks team!”
“We wanted to install an AC in our condo and replace the old gas furnace. We are happy that we had business with Nur HVAC. Their estimator was a professional who explained us all the options including the least expensive ones. Their quotes and estimates looked honest and fair, their pricing was way better than the competitors (almost twice less the amount than some other greedy dealers). We decided to proceed and made an appointment for the installation. The equipment installed is modern and quiet. The consumables used were all high quality and brand new. The guys were professional, on time, diligent and not cutting corners during the installation process. All conduits look neat and nice. Everything looks great. They left the place tidy and clean. After we used the system for a couple of days we realized that some custom tuning might be necessary for our apartment, to which Nur HVAC quickly made a new appointment and fixed all the issues for free. Nur HVAC are reliable, responsible and dependable. I highly recommend them to everyone who needs HVAC services in Bay Area. P.S. We got a few quotes from other companies too. They were sending us basically a sales person who would be just trying to figure out how much we could afford to pay. So I ended up with a few obviously unfair quotes which I didn't want to proceed with. Also the sales people were not always nice. Once they find out your budget is tight, they kinda lose interest in you. Reluctantly talking and just leaving as soon as they can.”
“My AC unit stopped working 2 months ago and I called several service companies for a quote. Nur offered a free appraisal and quote. I decided to go ahead with him and he was extremely professional, thorough and knowledgeable. He arrived exactly on time, wore mask and booties inside the house, showed me all the readings to educate me on where the problem was and fixed the issue within the time he estimated. Yesterday, during a record breaking heat wave, it felt like my AC unit stopped working again. I called Nur and he came down to inspect the unit, and showed me where PG&E had turned off my AC unit remotely. And he didn't charge me for the visit since there wasn't any problem. 10/10 would recommend , and will only use him for all my AC needs from here onwards.”
“Michael Potapov from Nur HVAC was courteous/polite and most most importantly knew what he was doing. Good work: Satisfied with the work.”
“I highly value honest person and David is very honest and reliable. I wanted to install a home electric charger with very minimum knowledge and some peoples may over charge or push me to do extra works. But David told me what I need and finished work quick and clean. I highly recommend him for any electric work.”
Google Reviews
What our customers say on Google
“Showed up on busy hot day, climbed in attic and fixed the a/c for what I thought was a very fair price. Thank you Nur HVAC!!”
“I’m a property manager for several rentals here in the California area and I have to say I’ve always been extremely satisfied with all of the HVAC technicians that have come out to help us with our residence. Each technician has been helpful, professional, punctual, repaired issues efficiently and have never overcharged us for any labor parts or services. We will continue to have them as our list of contractors. Thank you to Islam and David for your continued service.”
“Nur HVAC are real professionals and get the job done. I had a last-minute call to them, and they were able to accommodate me for next day, and the tech Islam worked really hard, kept updated on every step and possible fall outs in future due to the unit being old. Overall, they were really professional, quick and would recommend for sure.”
“With the heat wave going on and all of a sudden my AC system failing, I couldn’t find anyone to come immediately except Nur HVAC which fit me in and sent Michael over within a few hours to check and repair my system. Michael found a number of issues that he fixed and also made suggestions for future maintenance. I really appreciated the good work and happy to have my AC working quickly again.”
“Excellent hvac installers. Reasonably priced, extremely clean work. Installers were: Eldar and Maxim. Very efficient, detail oriented. Very respectful. Consult: Elias. Very responsive and knowledgeable. Nur is a diamond certified Mitsubishi installer. And the work quality shows.”
“Our air conditioner started making strange noises. But cane out to look at the condenser unit. It turns out that someone had left a garbage bag in top that got sucked in and wrapped around the fan. They did not charge is anything. This is the third time we have used Nir for heating or air conditioning. They have been prompt, efficient, reasonably priced and courteous. I highly recommend them.”
“Islam D was very efficient in troubleshooting and repairing the air conditioner”
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