17
TROUBLESHOOTING
For your safety, water heater service should be performed only by a qualified service technician.
Read the GENERAL SAFETY INFORMATION section first
.
PROBLEM
POSSILBE MALFUNCTION
SERVICE TO BE PERFORMED
NOT ENOUGH OR NO HOT WATER
1) Blower will not run.
A) "ON/OFF" control switch turned off.
Turn switch to the on position.
B) Blower unplugged.
Plug blower back into 115 vac. outlet.
C) No power at outlet.
Repair service to outlet.
D) "ON/OFF" switch defective.
Replace switch.
E) Control harness defective.
Replace control harness.
F) Blower motor defective.
Replace blower and motor.
2) Blower running, burner not on
Replace switch.
A) Fan not running fast enough to close
air switch contacts.
Check for low voltage, less than 102 vac.,
have service checked and repaired.
B) Air pressure switch defective.
Replace switch.
C) Gas valve defective.
Replace gas control valve/ thermostat.
D) Control harness defective.
Replace harness.
E) Igniter defective.
Replace ignitor.
F) Unit has completed three trials to light
and fail.
Reset cycle by turning switch off and then
back on. If unit does not light in three tri-
als, contact a qualified person for service.
3) Thermostat problems
A) Thermostat set too low.
Set temperature control higher.
B) Thermostat or ECO defective.
Replace gas control valve/thermostat.
C) High limit control circuit open.
Replace high limit control.
4) Others
A) Heater undersized.
Reduce hot water usage.
B) Low gas pressure.
Contact a qualified person for service.
C) Incoming water is unusually cold.
Allow more time for heater to re-heat.
D) Leaking hot water pipes or fixtures.
Have plumber check and repair leaks.
CONDENSATION
A) Water on the floor under heater.
See "Condensation"
WATER LEAKS
Improperly sealed, hot or cold supply
connections, relief valve, drain valve or
thermostat threads.
Turn off heater & water, repair unit.
Leakage from other appliances or water
lines.
Inspect other appliances near water
heater.
Condensation of flue products.
Refer to "CONDENSATION"
LEAKING T&P VALVE
Thermal expansion in closed water sys-
tem
Install thermal expansion tank (DO NOT
PLUG T&P VALVE)
Improperly seated valves
Check relief valve for proper operation
(DO NOT PLUG T&P VALVE)
HOT WATER ODORS OR COLOR
(Refer to CATHODIC PROTECTION)
High sulfate or mineral content in water
supply or iron or sulfate reducing bacteria
in water supply
Drain and flush heater thoroughly, chlori
-
nate, refil and flush again then chlorinate
water supply.
Содержание BBCN375T754NV 100 Series
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