Bryant 986TC - TROUBLESHOOTING GUIDE; Troubleshooting Flowchart and Status Codes

986TC: Installation, Start-up, Operating, Service and Maintenance Instructions
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A190174
Fig. 73 – Troubleshooting Guide
Is AMBERLED statuslight on?
Is there 24V at SEC-1 and SEC- 2? Is there 115V at L1 and L2?
Replace furnace control.
Replace transformer. Re p l a c e d o o r s w i t c h .
Is there 115V going to switch?
Is door switch closed?
Is circuit breaker cl osed?
Check for continuity in wire from circuit breaker to furnace. Close circuit breaker and go back to START.
Is AMBERLED statuslight blinking rapidly without a pause?
Check for correct line voltage polarity. If
units are twinned, check for proper low- voltage (24V) transformer phasing. Verify unit is properly grounded.
Is AMBERLED status light blinking ON/OFF slowly with a combination of
Determine status code. The status code determined by the number of short
To recall previous status codes disconnect the R thermostat connection, reset power, and put setup switch SW1-1 in the ON position. The AMBERLED are erased after 72 hours or can be manually erased by putting setup switch SW1-1 in the ON position and jumpering R, W/W1, and Y/Y2 simultaneously
setup switch SW1-1 in the OFF position. Was there a previous status code other than #11?
Go t o sec ti on b el ow fo r t he st at us code
Does the control respond to W/W1, W2, Y1, Y/Y2, and G (24V) thermostat signals? Run system through a low-heat, high- heat, or cooling cycle to check operation. Status codes are erased after 72 hours or can be manually erased by putt ing setup switch SW1-1 in the ON position and jumpering R, W/W1, and Y/Y2 simultaneously until status code #11 is
Is 24V present at W/W1, W2, Y1, Y/Y2 or G thermostat terminals on the furnace control?
Check room thermostat or interconnecting cable. Disconnect all the thermostat wires from the furnace control. Does the problem repeat when using a jumper wire?
Replace furnace control.
The t h erm ost at i s n ot com pat i bl e w it h t he furnace control. Either install a ballast resistor, connect the Com24V thermostat terminal to the thermostat, or replace the thermostat.
YES NO
YES
YES
YES
YES
YES
YES
START
YES
YES
NO NO
NO
OONN
NO
O ON N
NO
NO
NO
Close the door switch.
YESYES
YES