Rheem RGPE series Installation Instructions Manual page 64

Remove heat call by setting T-stat set point below
room temperature. For communicating t-stats, go to
"setup" menu and set fixed fire rate to low. For legacy
systems, ensure low heat call w/ 24vac on W1and 0
VAC on W2. Initiate new heat call. Allow heat call to
proceed through blower on delay. The burners drop
from high fire to low rate and I.B.M. energizes at low
heat CFM.
FIGURE 45
TROUBLESHOOTING CHART – CONTINUED
After Blower on delay, Does IDM switch to low speed
and remain at low speed after switching?
Does I. B. M. energize at low speed?
Does furnace continue to operate at low
fire until T-stat satisfied or heat call
removed?
Remove heat call by setting
T-stat below room temp.
Does IDM Shut off after post purge?
Does I. B. M. shut off after 90 seconds? (plus slew)
Remove power to furnace, open blower compartment
and restore dip switches to original settings. Replace
blower door. Restore power to unit.
64
- Check wire and all connections between I.F.C.J2 and I.D.M
- Check for 115 VAC on P2.
- Check I.D.M. capacitor.
- Check I.D.M. low speed. Replace if neccessary.
Check to make sure test mode dip switches are properly set.
Ensure T-stat not
switching to high fire or
test mode not timing out
(1 hour limit)
Double check - is heat call
completely off at IFC?
Fault code displayed?
See FAULT CODES under
troubelshooting in the I & O Manual
REPEAT THIS SEQUENCE UNTIL TROUBLE- FREE OPERATION
- Check test mode dip switches.
- Make sure test mode has not
expired (1 hour limit).
CHECK:
- Fault codes at IFC SSD - see FAULT CODES under troubleshooting
in I&O manual.
- 24V Between IFC pins J16, Pin 4 & J16, Pin 5 of I.F.C.
- Make sure heat call present at T-stat.
- T-stat wires and connections
PROBLEM PERSISTS
- Check all connections between IFC and ECM motor.
- Check 24V to ECM Motor. (low voltage connector, pins 1 & 4)
- Check P.F.C. Choke.
- Check all wiring and connections to P.F.C. choke.
- Check fault code display and see "fault codes" In I & O.
** System will attempt to light 4 times. Voltage Is present at gas valve for
only 7 seconds during each ignition trial. System will enter a 1 hour
lockout after 4 attempts.
C
92-22744-24-00