Installations Instructions

58
TROUBLESHOOTING CODES
Message Code
• •
Furn ace f ails to operate on high stage; f u rnace operates normally on low stage. Integrated control module LED display provides
E8
error code.
E8
• • •
High stage pressure switch circuit is closed at start of heating cycle. Induced draft blower is operating. Fu rn ace is operating on low stage on l y
PS2
CLOSED
E8 •
•
High stage pressure switch contacts sticking. Shorts in pressure switch circuit wiring.
• •
Replace high stage pressure switch. Repair short in wiring
• •
Turn power OFF prior to repair. Replace p ressure swi tch wi th correct replacement part.
• •
Furn ace f ails to operate on high stage; f u rnace operates normally on low stage. Integrated control module LED display provides
E9
error code.
E9
• • •
High stage pressure switch circuit is not closed. Induced draft blower is operating. Fu rn ace is operating on low stage on l y
PS2
OPEN
E9 •
• • •
Pressure switch hose blocked pinched, or connected improperly. Blocked flue and/or inlet air pipe, blocked drain system or weak induced draft blower. Incorrect pressure switch set point or malfunctioning switch contacts. Loose or improperly connected wiring.
• • • • •
Inspect pressure switch hose. Repair/replace if necessary. Inspect flue and/or inlet air piping for blockage, proper length, elbows, and termination. Check drain system. Correct as necessary. Check induced draft blower performance. Correct as necessary. Correct pressure switch set point or contact motion. Tighten or correct wiring connection.
• • •
Turn power OFF prior to repair. Replace p ressure swi tch wi th correct replacement part. Replace ind uced draf t blower with correct replacement part.
• • • •
Furn ace f ails to operate. Integrated control module LED display provides
EA
error code.
ComfortNet thermostat “ Call for Service” icon illuminated. ComfortNet thermostat scrolls “ Check Furnace” messag e.
EA
• Polarity of
115 v o l t A C i s reversed
REVERSED
PLTY
EA •
•
Polarity of 115 volt AC power to furnace or integrated module is reversed. Reversed unit ground.
• • •
Review wiring diagram to correct polarity. Verify proper ground. Correct if necessary. Check and correct wiring.
• Turn power OFF prior to repair.
• • • •
Furn ace f ails to operate. Integrated control module LED display provides
d0
error code.
ComfortNet thermostat “ Call for Service” icon illuminated. ComfortNet thermostat scrolls “ Check Furnace” messag e.
d0
•Data not yet
on network.
NO NET
DAT A
d0 • Furnace does not contain any
shared data.
• Populate shared data set using
memory card.
• • • • •
Turn power OFF prior to repair. Use memory card for the specific model. Insert memory card BEFORE turning power ON. Memory card may be removed after data is loaded. Turn power OFF before removing memory card. Error code will be cleared once data is loaded.
• • • •
Operation diff erent than expected or no operation. Integrated control module LED display provides
d4
error code.
ComfortNet thermostat “ Call for Service” icon illuminated. ComfortNet thermostat scrolls “ Check Furnace” messag e.
d4
• Invalid memory
card data.
INVALID MC
DAT A
d4 • Shared data set on memory card
has been rejected by integrated control module
• Verify shared data set is correct for
th e specif ic model. Re-populate data using correct memory card if required.
• • • • •
Turn power OFF prior to repair Use memory card for the specific model. Insert memory card BEFORE turning power ON. Memory card may be removed after data is loaded. Turn power OFF before removing memory card. Error code will be cleared once data is loaded.
Symptoms of Abnormal Operation
(Non-communicating
& ComfortNet™ Thermostat)
ComfortNet
Thermostat Only
Possible Causes Corrective Actions Notes & Cautions
Diagnostic
& Status
LED Codes
Fault
Description