Service Guide

SERVICING
34





 

S

R R SR R
S S 

 R SRS 
 RS

R   S  S RR
 RS JR R 
RED
RESET
BUTTON
COLOR
IDENTIFYING



  SS R  RS  XR  R

  S   S   Q SRR
S R   XR   R
RS 

A temperature activated manual reset control is mounted to
the manifold assembly on 80% furnaces,




The control is designed to open should a ame roll out occur.
An over ring condition or ame impingement on the heat
shield may also cause the control to open. If the rollout control
opens, the air circulation blower will run continuously.
On single-stage 80% the ignition control diagnostic light will
ash (6) six times indicating a trip of the rollout switch. (on
some models this also indicates an open control board fuse)

   RS

1. Remove the burner compartment door to gain access to
the rollout switch(es) mounted to burner bracket.
The servicer should reset the ignition control by opening and
closing the thermostat circuit. Then look for the ignitor glowing
which indicates there is power to the ignition control. Measure
the voltage between each side of the rollout control and
ground while the ignition control tries to power the gas valve.
2. Measure the voltage between each side of the rollout
control and ground during the ignition attempt. Refer to
the following gure.