Original message
| cedric
 |  "flames go on and off"
, posted Tue 23 Jan 17:27  
working on a Lennox rooftop. the thermostat calls for heat then the unit starts working. somewhere in between the flames must go off. I open the panel and the flames come back on. The highest temp it gets in the room is 62 degrees. What is causing this problem? I hear the unit igniting itself over again.
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Replies:
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| cool p
| "Re(1):flames go on and off" , posted Tue 23 Jan 21:37:
I just ran into the same problem and it was the flame rod senser give it a try
I AM WORKING ON A RHEEM ROOFTOP UNIT AND THERE IS NO HEAT 5 TONS 120000 BTUS I HAVE POWER TO THE INDUCER FAN MOTER BUT THE FAN NO WORK PLEASE HELPME
[this message was edited by cool p on Tue 23 Jan 21:44] |
| | Antonetz
| "Re(2):flames go on and off" , posted Tue 13 Feb 11:55
if you have an ohm's meter, unplug motor at quick connect an you should have continuity through the motor windings. if not replace motor. Antonetz r. p. hope this helps, let me know.
R.P.Antonetz
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| tom446
| "Re(1):flames go on and off" , posted Tue 23 Jan 17:39
Just a guess, but maybe it's going out on limit. The best place to start would be to check and make sure you filters and evaporator coil are clean. Also check for cracked heat exchangers.
If in doubt call a pro !
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| | cedric
| "Re(2):flames go on and off" , posted Fri 2 Feb 17:18
I checked all limits and the filters. I then replaced the limits. It still goes off on the limit at the tube heat exchanger. It seems like there is some sort of a restriction but I can't find it The temp gets to 69, which isn't bad but the customer wants it warmer.
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| | tom446
| "Re(3):flames go on and off" , posted Fri 2 Feb 19:07
where is this limit located that keeps going out
If in doubt call a pro !
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| | cedric
| "Re(4):flames go on and off" , posted Wed 7 Feb 23:02
the limit at the tube heat exchanger. I checked to see if it was cracked but I didn't see anything.
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| | marchvac
| "Re(5):flames go on and off" , posted Thu 7 Feb 13:21
What is model and serial#
Be careful sometimes you don't get a second chance
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| | rickmcd72
| "Re(5):flames go on and off" , posted Wed 28 Feb 17:55
Your problem is the heat exchanger, its either cracked or rotted-
Rick
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| | Antonetz
|  "Re(5):flames go on and off"
, posted Tue 13 Feb 11:48
i recently had almost the same problem, replace flame sensor or remove & steel wool. insure with thermometer that heat exchanger temps. are as designed temp. rise through unit, s.a vs r.a. check flames for roll out when blower kicks on, note: this indicates a bad heat exchanger, insure your themostat anticipator is properly set & you are not losing 24v signal from thermostat. Antonetz r.p. hope this helps, let me know.
R.P.Antonetz
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