Daikin DM96VE, Service Manual

Page: 54 / 74

54
SERVICING
Service Problem No Heat
Unsatisfactory
Heat
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
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Test Method
Remedy
S
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P
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Pow er Failure
•
Test Voltage S-1
Blow n Fuse
•
Test Voltage
S-4
Loose Connection
•
Check Wiring
S-2
Shorted or Broken Wires
•
Check Wiring S-3A
No Low Voltage
•
Check Transformer S-4
Faulty Thermostat
• • • • •
Check Thermostat S-3A
Faulty Transformer
•
Check Transformer
S-4
Poor or High Resistance Ground
•
Measure Ground Resistance S-17B
Improper Heat Anticipator Setting
• • • •
Adjust Heat Anticipator Setting S-3B
Improper Thermostat Location
• • • •
Relocate Thermostat S-316
Faulty Limit or Roll Out Sw itch
• •
Test Control
S-300 / S-302
Faulty Flame Sensor
•
Test Flame Sensor S-314
Faulty Ignition Control
• • •
Test Control S-313
Gas Valve or Gas Supply Shut Off
•
Turn Valves to On Position S-317
Faulty Induced Draft Blow er
• •
Test Induced Draft Motor
S-303
Faulty Blow er Motor (PSC)
• •
Test Blow er Motor (PSC)
S-16A,B,C
Broken or Shorted Ignitor
•
Test Ignitor
S-308
Dirty Flame Sensor, Low UA
•
Clean Flame Sensor S-314
Stuck Gas Valve
• • •
Replace Gas Valve S-304
Faulty Gas Valve
• • •
Replace Gas Valve
S-304
Open Auxiliary Limit
• •
Reset Control
S-301
Improper Air Flow or Distribution
• •
Check Duct Static S-200
Cycling on Limit
• • •
Check Controls & Temperature Rise S-201 / S-300
Delayed Ignition
•
Test for Delayed Ignition
S-312
Flashback
•
Test for Flashback
S-309 / S-311
Orifice Size
• • •
Check Orifices S-306 / S-311
Gas Pressure
• • • •
Check Gas Pressure S-307
Cracked Heat Exchanger
•
Check Burner Flames S-305
Furnace Undersized
• •
Replace w ith Proper Size Furnace
S-318
Furnace Oversized
•
Replace w ith Proper Size Furnace
S-318
Faulty Pressure Sw itch
• • •
Test Pressure Sw itch S-310
Blocked or Restricted Flue
•
Check Flue/Draw dow n Pressure S-310
Open Roll Out Sw itch
• •
Test Flame Roll Out Control S-302
Bouncing On Pressure Sw itch
•
Test Negative Pressure
S-310