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Old 11-04-2014, 08:38 AM
 
Location: Southern California
12,713 posts, read 15,468,522 times
Reputation: 35512

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We live in a tiny house and have central ac/heat. The unit is older and is on the roof (not a split system). When I tried turning on the heat for the first time the other day nothing happened. I was told this unit "probably doesn't have a pilot and should just turn on". I'm waiting for a guy to come out and take a look but I'm at his mercy and who knows when he will come.

We recently had a tankless hot water heat hooked up if that makes any difference.

Anyone have any suggestions on what this could be or what needs to be done?
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Old 11-04-2014, 09:28 AM
 
Location: Johns Creek, GA
17,444 posts, read 65,798,103 times
Reputation: 23573
Turn the gas on, the ignitor has failed...


Maybe you weren't holding your tongue right!?
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Old 11-04-2014, 09:58 AM
 
Location: Southern California
12,713 posts, read 15,468,522 times
Reputation: 35512
Quote:
Originally Posted by K'ledgeBldr View Post
Turn the gas on, the ignitor has failed...


Maybe you weren't holding your tongue right!?
I know it could be a million things, I was just looking for a few suggestions. Thanks.
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Old 11-04-2014, 05:58 PM
 
340 posts, read 662,880 times
Reputation: 374
Older gas furnaces have pilots, which in your case might have simply gone out and needs to be relit. Newer gas furnaces have ignitors. The ignitors on my furnaces seem to burn out every 2-3 years so, although I've heard that some of the newer ones are more reliable and last longer. In any case, I like to keep a spare ignitor on hand, just like spare light bulbs. Mine weren't hard to replace and cost $50 or so when I did it myself. If I had to have someone else install it, it would cost me $150-225 which included the ignitor. Good luck!
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Old 11-04-2014, 06:25 PM
 
11,550 posts, read 53,049,707 times
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Quote:
Originally Posted by Mr_Geek View Post

We recently had a tankless hot water heat hooked up if that makes any difference.
If it's a gas-fired tankless hot water heater, the installer may have turned the main gas supply valve off for his work, and didn't relight a pilot light on the HVAC unit when he was done with his work.
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Old 11-04-2014, 06:33 PM
 
621 posts, read 1,116,944 times
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Tankless W/H's use a LOT of gas! If the new tankless was attached to the existing gas service without major modification, you most certainly will impact the operation of every other gas appliance. In my area, larger meters and a larger dedicated gas line from the meter to the tankless is the norm. Have the heating guy take a look at the sizing of the gas line(s) while he's there.
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Old 11-05-2014, 10:40 AM
 
Location: Southern California
12,713 posts, read 15,468,522 times
Reputation: 35512
I wanted to post the resolution to this. It was a faulty thermostat. We had one of the old school mercury thermostats with the little levers up top.

Unfortunately I didn't get a chance to ask about the gas lines in relation to the new tankless water heater.

I'm renting this house and the owner did tell me when they had the tankless hooked up a lot of work was done.
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