A.O. Smith GPCR Owner's Manual page 18

PROBLEM
NOT ENOUGH
HOT WATER
VENT PIPE TOO HOT
(ABOVE 170°F)
YELLOW FLAME
CONDENSATION
WATER LEAKS
LEAKING T&P
HOT WATER ODORS
(Refer to CATHODIC
PROTECTION
WATER TOO HOT
WATER HEATER SOUNDS
SIZZLING-RUMBLING
SOOTING
HEATER LIGHTS
BUT GOES OUT
IN 4-5 SECONDS
TROUBLE SHOOTING (Continued)
CAUSE
1) Blower will not run.
A) "ON/OFF" control switch turned off.
B) Blower unplugged.
C) No power at outlet.
D) Thermostat defective.
E) Control harness defective.
F) High limit control circuit open.
G) Blower motor defective.
Thermostat problems.
A) Thermostat set too low.
B) Thermostat or ECO defective.
Others
A) Heater undersized.
B) Low gas pressure.
C) Incoming water is unusually cold.
D) Leaking hot water pipes or fixtures.
A) Defective air flow restrictor.
B) Not enough dilution air to mix with
flue gases.
C) Dilution air too hot for mixing with
flue gases.
D) Wrong burner orifice.
A) Dirt in burner ports
B) Combustion air path restricted.
C) Not enough dilution air for proper
combustion.
A) Water on the floor under heater.
B) Water dripping from blower assembly.
Improperly sealed, hot or cold supply
connections, relief valve, drain valve
or thermostat threads.
Leakage from other appliances or water
water lines.
Condensation of flue products.
Thermal expansion in closed water
system.
Improperly seated valve.
High sulfate or mineral content in
water supply.
Bacteria in water supply.
Thermostat set too high.
Condensation dripping on burner.
Sediment at bottom of heater tank.
Improper combustion.
Outlet polarity is reversed.
Turn switch to the "ON" position.
Plug blower back into 115 Vac. outlet.
Repair service to outlet.
Replace thermostat.
Replace control harness.
Replace thermostat.
Replace Blower Assembly.
Turn temperature control higher.
Replace thermostat.
Reduce hot water use.
Contact dealer.
Allow more time for heater to reheat.
Have plumber check and repair leaks.
Take unit out of service immediately, call the
manufacturer's representative.
Proper dilution air must be provided for
combustion and dilution of flue temp.
Refer to "INSTALLATION" section.
Supply air is too hot. Check for heat sources
around and/or blockage of dilution air intake.
Install correct orifice.
Turn off heater and gas, clean burner head.
Check dilution air intake, exhaust venting, and
air openings in bottom base pan for
obstructions or blockage.
Check dilution air intake for obstructions
or blockage.
See "CONDENSATION" section.
Install condensate drain hose (supplied locally)
on drain port of rubber boot of blower assembly
or provide a drip "TEE" in the vent pipe to catch
the condensation. See figure 1 and the
Installation of Vent System instructions.
Tighten threaded connections.
Inspect other appliances near water heater.
Refer to "CONDENSATION" section.
Install thermal expansion tank (DO NOT plug
T&P valve).
Check relief valve for proper operation
(DO NOT plug T&P valve).
Drain and flush heater thoroughly then refill.
Chlorinate water supply.
Refer to HIGH TEMPERATURE REGULATION.
Refer to CONDENSATION above.
Clean sediment from tank. Refer to DRAINING
instruction in Maintenance section of manual.
Refer to AIR REQUIREMENTS on page 4.
Test polarity and correct.
18
SOLUTION