2 • Condensing Models: On-Demand Water Heater Service Handbook
TABLE OF CONTENTS
Specifications.................................................................................................................................................................................................................4
Introduction...................................................................................................................................................................................................................5
General Installation Guidelines .....................................................................................................................................................................5
Normal Operation .........................................................................................................................................................................................................6
Activation ......................................................................................................................................................................................................6
Operation ......................................................................................................................................................................................................6
Shutdown ......................................................................................................................................................................................................6
Troubleshooting ............................................................................................................................................................................................................7
Preliminary Checklist .....................................................................................................................................................................................7
Gas/Water/Electric: ...................................................................................................................................................................... 7
Remote Controller: ....................................................................................................................................................................... 7
High Altitude: ................................................................................................................................................................................ 7
Long Vent Run ................................................................................................................................................................................ 7
Hard Water: .................................................................................................................................................................................. 7
New Installations: ......................................................................................................................................................................... 7
External Problem: ......................................................................................................................................................................... 7
Next Step: ..................................................................................................................................................................................... 7
General Issues ...............................................................................................................................................................................................7
Water is not hot enough. .............................................................................................................................................................. 7
Water is too hot. ........................................................................................................................................................................... 8
Temperature fluctuates when a fixture is opened. ........................................................................................................................ 8
Unit does not ignite when water goes through it. ......................................................................................................................... 9
Abnormal sounds come from the unit. ......................................................................................................................................... 9
Error Codes ..................................................................................................................................................................................................10
Incorrect DIP Switch Settings ...................................................................................................................................................... 12
Abnormal Combustion ................................................................................................................................................................ 12
Ignition Failure / Flame Loss ....................................................................................................................................................... 12
Outlet Thermistor Failure ........................................................................................................................................................... 13
Inlet Thermistor Failure ............................................................................................................................................................. 13
Exhaust Thermistor Failure ........................................................................................................................................................ 14
Air-Fuel Ratio Rod Failure ........................................................................................................................................................... 14
Abnormal Solenoid Gas Valve .................................................................................................................................................... 14
Abnormal Fan Motor .................................................................................................................................................................. 15
False Flame Detection ................................................................................................................................................................ 16
Remote Control Problem ............................................................................................................................................................ 16
Abnormal Exhaust Temperature ............................................................................................................................................... 17
Abnormal Combustion ............................................................................................................................................................... 17
Dip Switch Settings ......................................................................................................................................................................................................19
Wiring Diagram............................................................................................................................................................................................................22
