Detroit Radiant Products Company MP Series - Manual (Page 15)

15
TH-PUI Series
4.0 Troubleshooting and Service
Troubleshooting
When ‘Reset Control’ is performed, installer configurations and programming will reset to default factory settings.
Symptom Cause Corrective Action
Blank Screen Control is wired improperly.
Power to heater is off.
Heater control board has open fuse. Correct wiring.
Restore power to heater.
Replace 3A ATO or APS (Violet) fuse.
No Heat Improper wiring.
Improper control set-up. Correct wiring.
Verify proper control set-up.
Heater requires service.
Blower Flue or intake obstruction.
Motor seized.
Improper wiring to motor.
Pressure tubes incorrectly installed.
Bad pressure sensor. Remove obstruction.
Verify blower operation.
Correct wiring.
Repair pressure tube connections.
Replace modulating circuit board.
Ignition Module
Failure Failed ignition module.
Faulty pressure switch.
Faulty wiring. Correct wiring.
Replace faulty pressure switch.
Replace faulty ignition module.
Ignition Soft Lockout Flame sense failure.
Faulty gas valve.
Faulty heater wiring.
Broken glo-bar. Heater needs service.
Replace ignition module.
Replace gas valve.
Correct faulty heater wiring.
Ignition Hard
Lockout Multiple flame sense failures.
Faulty gas valve.
Faulty heater wiring.
Broken glo-bar. Reset main power to heater.
Reset controller.
Heater needs service.
Replace ignition module.
Replace gas valve.
Correct faulty heater wiring.
Consult factory.
Sensor Error Incorrect sensor selected in set-up.
Open or shorted thermistor.
Improper thermistor type.
Incorrect displayed temperature. Verify proper control set-up.
Correct wiring.
Replace thermistor.
Internal Software
Error Bad checksum. Reset control.
Replace control.
Consult factory.
Model Selection or
Setup Error Invalid model.
Incorrect DIP configuration. Verify model selector jumper with factory.
Verify DIP switch settings.
Communication
Error (MC) Control cannot establish communication with heater.
Faulty wiring.
Software failure. Reset control.
Verify correct wiring.
Consult factory.
Communication
Error (UI) Heater cannot establish communication with controller. Reset control.
Verify correct wiring.
Consult factory.
Error with User
Interface Key pad shorted or closed for a time greater than
1 minute.
Ribbon connector is not properly connected. Verify proper connection of ribbon connector.
Reset control.
Replace keypad.
Consult factory.
Chart 4.1 • Troubleshooting Chart