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CheapScotsman

Member Since 18 May 2007
Offline Last Active Feb 22 2013 06:52 PM

Posts I've Made

In Topic: Rheem Classic 90 .. burners for 7 seconds then stops

21 February 2013 - 10:39 PM

Guys ... thanks for all your help

 

Detailed examination of the board indicates scorch marks under a couple of the resistors so it definitely appears that something went on
the board

 

I've replaced the main control board and the furnace is now working perfectly (again).


In Topic: Rheem Classic 90 .. burners for 7 seconds then stops

20 February 2013 - 12:17 AM

The control board has bunch of numbers but the most relevant seem to be 1028-927, 1028-83-9271A and 62-24140-01


In Topic: Rheem Classic 90 .. burners for 7 seconds then stops

19 February 2013 - 11:48 PM

I jumpered the C Terminal to the burners and it made no difference.

 

While I try and get a video that works ... some additional troubleshooting ...

 

With the meter set at VAC and one lead on the C terminal (ground) on the circuit board.
 
When calling for heat (before inducer motor starts),

  • The vent pressure switch reads 24 VAC on one terminal and 0 VAC on the other
  • The drain pressure switch reads 14 VAC on one terminal and 0 VAC on the other

When the inducer motor starts,

  • The vent pressure switch reads 24 VAC on both terminals
  • The drain pressure switch reads 0 VAC on both terminals

When the igniter starts (and through the entire 7 second burn cycle)

  • The vent pressure switch reads 24 VAC on both terminals
  • The drain pressure switch reads 24 VAC on both terminals

In Topic: Rheem Classic 90 .. burners for 7 seconds then stops

19 February 2013 - 08:52 PM

Buners are clean (at least that is how it looks to me). Nothing has changed on either the furnace nor house wiring. I'll jumper the cable as you suggested and try and put a video together tonight.

 

Thanks for you help.


In Topic: Rheem Classic 90 .. burners for 7 seconds then stops

19 February 2013 - 10:43 AM

Thanks for your reply

 

The flame sensor was cleaned with steel wool and is very clean

The flame cuts out pretty instantly about 5-7 seconds after starting

There is no light "code". There are 3 LEDs on the control board. The two green ones are always ON while the yellow is always OFF.

During the 7 second main burners on, the full apperas to be full on and the flame sensor is embedded in the flame.

 

I am using a digital multimeter inline to measure the flame sensor current. In the cycle above

On the first fireup, it reads ZERO uAMPS MAX til flameout in 7 seconds

On the second fireup, the current reading jumps all around but didn't get above 1.5 uAMPS. Within two seconds the multi-meter is showing ZERO uAMPs for the the rest of 7 second burn till the burner cut off

 

the cycle is very consistant in its repetitiveness, however, the current draw is not. I run another cycle and get MAX 2 uAMPS for the first two seconds or flat ZERO for the first two seconds or maybe even 4uAMPS for the first two seconds ... Note that these are max. During those first two seconds the meter might show .2 then 1.5 then .8 then .4 then 1.2 ... but at the end of about two seconds, it is reading ZERO consistantly. The flame runs for another 5 then cuts out.

 

I'll take and post a video tonight.

 

Thanks for your help.



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