Table Of Contents - A.O. Smith GCV300 Service Handbook

TABLE OF CONTENTS

General Safety .................................................................................................................................................... 4
Completed Installation (typical) ......................................................................................................................... 6
System Basics ..................................................................................................................................................... 7
Honeywell® Gas Control Valve/Thermostat ............................................................................................................................ 7
Gas Pressures ............................................................................................................................................................ 7
Temperature Settings ................................................................................................................................................ 7
Combustion Chamber with TCO Switch .................................................................................................................................. 8
Lighting the Pilot / Diagnostic Flash Codes ......................................................................................................... 9
Lighting the Pilot: ................................................................................................................................................................... 9
If the Status Light Does Not Blink: ........................................................................................................................................... 9
If the Pilot Does Not Light: ...................................................................................................................................................... 9
If the Pilot Lights but the Status Light Does Not Blink: ............................................................................................................ 9
Diagnostic Flash Codes .......................................................................................................................................................... 10
0 Flashes (LED not lit) ............................................................................................................................................ 10
Status Light On (solid) ........................................................................................................................................... 10
1 Flash ................................................................................................................................................................... 10
2 Flashes ................................................................................................................................................................ 10
4 Flashes ................................................................................................................................................................ 10
5 Flashes ................................................................................................................................................................ 10
7 Flashes ................................................................................................................................................................ 10
8 Flashes ................................................................................................................................................................ 10
System Checks .................................................................................................................................................. 11
Draft Test .............................................................................................................................................................................. 11
Connections Check ................................................................................................................................................................ 11
Gas Pressure Checks .............................................................................................................................................................. 11
Thermopile Check (Open Circuit) .......................................................................................................................................... 12
Thermopile Check (Closed Circuit) ........................................................................................................................................ 12
Common Issues ................................................................................................................................................ 13
No Hot Water ........................................................................................................................................................................ 13
Not Enough Hot Water .......................................................................................................................................................... 13
2 • Residential Standard Gas Water Heater Service Handbook 2 • Residential Standard Gas Water Heater Service Handbook 2 • Residential Standard Gas Water Heater Service Handbook
Lower Seasonal Water Temperatures ....................................................................................................... 13
Faulty Shower Control Valve/Faucet Valve ............................................................................................... 14
Thermostat Set Too Low ........................................................................................................................... 14
An Increase in Hot Water Usage ............................................................................................................... 14
Undersized Water Heater ......................................................................................................................... 14
Reversed Water Connections ................................................................................................................... 14
Leak in the Plumbing System ................................................................................................................. 14
Sediment Buildup in the Tank ................................................................................................................... 14