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Old 01-10-2010, 11:37 AM   #16
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Losing burner flame and pilot flame


Ok bad news, I talked with my tech and he says that I don't have that type of limit shut off, it would just shut off the main burner. I also found out that my model number was wrong, it is actually a DVCF653B. I thinks it a pilot oriface problem. He thinks the pilot is too big and that will give a low reading on the thermocoupler, so he is trying to find a new oriface for me now. I personally don't think this is going to solve the problem but it is kind of leaning towrards the only thing to that makes sense...some thing has to be telling the gas valve to shut down the pilot.

On a side note, the parts diagram calls for a Robert Shaw gas valve 7200ER part 72090, and they did replace that with a Honeywell in Dec 07.

Any other ideas?

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Old 01-10-2010, 12:34 PM   #17
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Losing burner flame and pilot flame


How did the orifice become too big. Or did this heater never work right.
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Old 01-10-2010, 01:37 PM   #18
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Losing burner flame and pilot flame


From the instruction manual. The overfired or loos cover areont the pilot would be the most likley problems.

Pilot and main burner 1. Weak thermocouple. 1. Check millivoltage and replace if low.
go out during normal 2. Input too high. 2. Check input rate.
operation 3. Cover around pilot lighter hole not sealed 3. Tighten wing nuts securing cover and sight glass. air tight. Check and replace gasket if needed.
4. Vent tubes not properly installed or 4. Follow instructions. Check both exhaust and air
sealed. intake tubes, and vent cap.
Be sure all gaskets are in place and properly sealed.
Use only tubes and vent cap supplied. Do not alter vent tubes or cap.

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Old 01-12-2010, 01:03 AM   #19
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Losing burner flame and pilot flame


After much trial and tribulation I think it's fixed. If this makes sense...it was overfireing and that caused the pilot to get to hot (its very close to the burner) and eventually shut down. We check the manifold pressure and we got 3.5 wc which is what the manual specs it for, but we bumbed it down to 3.0 wc and has been working with no problems. Thanks for all the help guys.
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Old 01-12-2010, 01:32 AM   #20
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Losing burner flame and pilot flame


well glad its "fixed" but doubtful it has anything to do with an overheating pilot as its engulfed in flame and is frequently cherry red. sounds more like it was infact a limit issue the whole time
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Old 01-12-2010, 04:58 AM   #21
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Losing burner flame and pilot flame


It was NOT over firing. If it was over firing at 3.5". Then it never would have worked right from day one.
All you did was cover up the problem. Not fix it.

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