Majestic Fireplace turns off after a few minutes....


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Old 02-10-16, 12:52 PM
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Majestic Fireplace turns off after a few minutes....

So our house came with a Majestic Fireplaces Model# CDVR42PSC7 with the "Signature Command System". It's been a PITA ever since I got it. I changed the thermopile once after it wouldn't light and now it will light just fine if the temp isn't too low. If the temp is really cold outside I have to flip it on, then flip it off, flip it on again until it lights because it will turn off and reset if the pilot stays on too long without ignition. Not sure if the thermopile needs to be replaced again but thats a minor annoyance compared to what it does now....

Now it will stay on fine for about 5 minutes and then inexplicably turn off. The pilot light is strong and blue. After it turns off it will beep annoyingly every few minutes until I turn the control box off. I looked in the manual and didn't see any troubleshooting for this specific problem. I'm thinking I might just buy a whole new pilot assembly? Maybe the thermocouple is bad? I'm not even 100% sure why there is a thermopile AND thermocouple.
 
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Old 02-11-16, 08:52 PM
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The thermocouple keeps the pilot valve open in the presence of the pilot flame.
The thermopile generates voltage in the presence of the pilot flame to open the main gas valve.

I'm confused..... you say you have a thermocouple and a thermopile which would suggest a standing pilot (always lit) system. Yet you are mentioning a control board which makes that an intermittent ignition unit which doesn't use a thermocouple.... it uses a flame sensor instead.


Look over this manual and see if it pertains to your unit. The last twenty pages are dedicated to diagnostics and service.
Page 52 deals directly with the Signature Command system.

literature/mhsc/majestic/manuals/20301835_CDVRT7_1.pdf
 

Last edited by PJmax; 02-12-16 at 05:04 PM. Reason: typo
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Old 02-12-16, 02:13 AM
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Thermopile

Yes that's the same manual I found. Unfortunately the troubleshooting on 52 doesn't directly have my symptoms. If you look on page 58 see item number 2. That thingie on the right is a thermopile if I'm not mistaken, it hooks to the valve control and I've replaced it. You gave me a clue with the thermocouple comment. Maybe the pilot is shutting off becuase the thermocouple ( thing on left) isn't working properly and the circuit is shutting the main burner off too. I have to check the sequence of what shuts off first.
 
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Old 02-12-16, 02:38 AM
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Yea just checked it. It beeps and everything turns off simultaneously. Hard to tell. I might just go ahead and replace the whole pilot assembly. I've actually already replaced the whole valve when I erroneously thought it was the problem over the thermopile previously. I figure the pilot assembly is like $60 and a service call is probably $100 just to look at it, let alone have them tell me I should replace the entire thing hah.
 
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Old 02-12-16, 12:55 PM
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It makes more sense to pay for a good diagnosis of a problem rather than spending money on expensive parts you are merely guessing may be bad.

And it takes time to order and install those parts. And especially for DIYers, it's quite easy to create new problems installing parts like gas valves, which in my opinion are not suitable DIY replacement projects.

In my opinion, the smart move for DIYers is to get whatever help you can to accurately diagnose a problem, then decide whether a DIY part replacement is worth while.
 
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Old 02-12-16, 01:13 PM
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Figured it out and it was kinda silly. I guess the remote I never use was low on batteries. I took the batteries out, no more problems! I guess it was sending bogus signals to it. Very wierd, but I really would have felt stupid paying $100 to have someone tell me to replace some batteries, lol.
 
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Old 02-12-16, 05:05 PM
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I've found that those remote batteries only last about a year. I change mine the same time every year.
 
 

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