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What needs to be done to fix a code 20 "twinning fault" on my rheem furnace

The AC works fine but when Heat is turned on the unit will not start and the control board in flashing a code 20. this is a single unit.

Posted by Im Little on

  • Jeremy Nov 02, 2020

    What was your outcome?

  • Jeremy Nov 02, 2020

    Can also be a 24volt phasing issue and a ground issue.

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1 Answer

Jeremy

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Check control board make sure no wiring is on twin on board or touching it. If so remove it to correct location. If no wiring there, board replacement.

Posted on Nov 02, 2020

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5 Related Answers

Anonymous

  • 148 Answers

SOURCE: No heat from unit. Hear ignitors start but no airflow in house

well i need to know if the fan comes on at all if not then it could be a bad motor or board which is not uncommon but if the fan does come on and then flames go out and fan stays running could be high limit check to make sure in the bower compartment there are no wires disconnected from the blower sometimes when changing the filter it is possible to knock the wire off the board

Posted on May 19, 2009

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Anonymous

  • 26 Answers

SOURCE: I have a goodman furnace and ac unit the fan and

Look at the contactor on the condensing unit, remove the low voltage wires to the contactor and turn on the system. If the low voltage fuse doesn't blow, replace the contactor.

Posted on Jul 07, 2009

Anonymous

  • 10 Answers

SOURCE: rg(bu)h-07eauer have replaced the control board will not heat

read wiring and make sure flame sensor is clean and make sure you have good ground

Posted on Oct 17, 2009

Therinnaiguy

Chandler Ede

  • 1420 Answers

SOURCE: 5 amp fuse continues to blow on control board for

You have a short on the 24 volt side of the unit. Check the thermostat wire for signs of pinching or direct short.

Posted on Oct 17, 2009

Anonymous

  • 10 Answers

SOURCE: I have a suburban lp furnace and duotherm air/heat

I'm not sure what the problem may be but you could try calling All Seasons RV Appliance Parts & Service. There number is 1-800-344-0673 they have helped me in the past. That and there tech calls are free so it wouldn't hurt to give them a call.

Posted on Feb 16, 2010

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Mr. Miller,

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then if so does your heat work fine

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