Troubleshooting - A.O. Smith Residential Power Vent Gas Water Heaters with Hot Surface Ignition Instruction Manual

Troubleshooting

WARNING
This troubleshooting guide has been supplied for use by
qualified service personnel who have a complete under-
standing of both electricity and gas.
No
Turn "ON" gas supply.
Call gas company to increase
gas pressure.
THERMOSTAT AND GAS SUPPLY CHECK
Is gas being supplied to the
thermostat?
GO TO SYSTEMS CHECK
SECTION, PAGE 36
35
WARNING
Label all wiring before disconnecting any wiring; to
ensure correct reconnection. Failure to follow this
instruction could cause improper and possible danger-
ous operation, resulting in DEATH, SERIOUS BODILY
INJURY, OR PROPERTY DAMAGE.
Is thermostat calling for heat?
Run (hot) water from heater and
set adjustment button higher.
Check using a manometer at
thermostat pressure tap.
Is there a minimum gas pressure
4" W.C. for natural gas or 10"
W.C. for propane (L.P.) gas?
No
Yes
Yes
Yes