Furnace Troubleshooting Guide - Daikin Maverick I Installation And Maintenance Manual

Troubleshooting

Furnace Troubleshooting Guide

START
SET THERMOSTAT TO
CALL FOR HEAT
SET FAN SWITCH TO AUTO
YES
INDUCED DRAFT BLOWER
MOTOR STARTS
YES
30 SECOND PREPURGE
YES
IGNITOR SPARKS
YES
MAIN BURNER LIGHTS
YES
50
▲
HAZARDOUS VOLTAGE
LINE VOLTAGE
CONNECTIONS
• CHECK LINE VOLTAGE TO IFC
NO
• CHECK LOW VOLTAGE TRANSFORMER
• CHECK WIRING
• CHECK FOR 208-230 VAC TO IDM MOTOR
REPLACE INDUCED
DRAFT BLOWER
NO • CHECK IGNITOR CABLE
• CHECK SPARK IGNITOR POSITION AND CONDITION
• IS EACH NEGATIVE PRESSURE SWITCH CLOSED?
• CHECK FOR OPEN ROLL-OUT CONTROLS
• CHECK FOR OPEN LIMIT
• CHECK IGNITION CONTROL CHASSIS GROUND WIRE
• CHECK WIRING
REPLACE IGNITION
NOTE: THE SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES WITH A 60 SECOND INTER-
PURGE BETWEEN TRIES. IF AFTER THE THIRD TIME THE BURNERS
DO NOT LIGHT, THE SYSTEM WILL LOCK OUT. IF THE UNIT IS EQUIPPED WITH A
UNITED TECH. THE SYSTEM WILL ATTEMPT TO LIGHT 4 TIMES EACH HOUR
UNTIL THE BURNERS LIGHT OR THE THERMOSTAT IS RESET OR POWER IS
REMOVED FOR 3 SECONDS OR GREATER.
NO
• CHECK INLET GAS PRESSURE
• CHECK 24 VOLTS TO GAS VALVE
• CHECK FOR GAS FLOW TO AND FROM VALVE
• CHECK BURNER CARRYOVER
REPLACE VALVE
FLOW CHART CONTINUED ON NEXT PAGE
WARNING
DISCONNECT POWER BEFORE
SERVICING.
SERVICE MUST BE BY A TRAINED,
QUALIFIED SERVICE TECHNICIAN.
YES
NO
CONTROL
YES
REPLACE INTEGRATED
CONTROL BOARD (IFC)
NO
REPLACE IGNITOR/
CABLE ASSEMBLY
• CHECK NEGATIVE PRESSURE
YES
SWITCH SENSING TUBE
• CHECK FOR EXHAUST
BLOCKAGE
NO
NO
YES
YES
REPLACE NEGATIVE
PRESSURE SWITCH
CHECK FOR EXHAUST,
INTAKE OR HEAT
EXCHANGER BLOCKAGE
AND RESET CONTROL
REPLACE LIMIT
IF UNIT IS COLD
REPLACE INTEGRATED
NO
CONTROL BOARD (IFC)
IF WIRING IS OK
Daikin IM 972-1