A.O. Smith PROLINE ELECTRIC 730098, Maintenance & Troubleshooting Manual

Page: 21 / 46

14 1-800-431-3000 En español 1-800-511-5652 hdsupplysolutions.com
If the thermal switch tripped, it is likely an air supply
problem. Clean air filter and flame arrestor. Room
must supply adequate air. Conduct “draft test.” Turn
main burner on. After five minutes of main burner
operation, smoke source should be drawn into draft
hood. If not, you have an air supply/venting problem.
After pilot lights, hold control knob in for 60
seconds. Release knob. If pilot stays lit, turn
thermostat to desired temperature (main burner
should light).
THERMAL SWITCH
DIDN’T TRIP
PILOT WON’T LIGHT
(GAS SUPPLY PROBLEM)
3
5
6
2
If the pilot doesn’t light, check igniter (look for
spark). If no spark, check igniter wires. If igniter
sparks, it’s likely a gas supply problem. Make sure
the main gas valve is on. Make sure the control knob
is fully pushed in. Check the gas pressure using a
manometer or gauge. If new installation, bleed air
from the gas line.
If the thermal switch didn’t trip, check the
thermocouple. Set meter to millivolts. Remove
thermocouple from control valve. Pilot must be lit.
Measure output of thermocouple. If the reading
is below 10mV, replace the thermocouple. If the
reading is above 10mV and all wiring connections
are secure, replace the gas valve.
THERMAL SWITCH TRIPPED
(AIR SUPPLY PROBLEM)
PILOT LIGHTS
TROUBLESHOO
TING & MAINTENANCE