Rheem HE119-130LP Use And Care Manual page 28

What they mean, controller functions, possible causes and suggested service remedies.
LED Flashing
LINE
Monitors incoming AC line voltage.
ON when line voltage is present.
Does not have 120 VAC
24 VAC
Monitors incoming voltage from the
transformer. ON when secondary 24
Does not have 24 VAC
VAC is present.
ECO/VENT SWITCH
Monitors the ECO switch. ON when
ECO switch is closed (normal
Water in tank too hot
position).
or
Monitors water temperature in the
Venting has a problem
tank and exhaust vent temperature.
or
To diagnose, must determine which
Water in tank too low
function is at fault.
PRESSURE SWITCH
Monitors the air pressure switch. ON
when the pressure switch is closed.
Combustion air blockage
Means there is sufficient combustion
airflow.
WATER TEMPERATURE
Monitors water temperature inside
Something is wrong with the
the tank (Thermostat). ON when the
temperature probe
water temp drops below set point
or
(temperature setting).
no or low water in tank
GAS VALVE
Monitors the gas valve output. ON
when power is applied to the gas
Ignition lock out
valve
No flame rectification
Unit will make three (3) successive
trials; then lock out.
BLOWER
Monitors the blower motor output.
Power to blower
ON when power is applied to the
blower.
IGNITOR
Monitors ignitor element output. ON
Power to ignitor
when power is applied to the ignitor
CONTROL HEALTH
Monitors the controllers hardware
System board OK
(circuit boards) and software. ON
when controller is functioning OK
GREEN LED ON MAIN Monitors polarity and ground circuit.
CONTROL BOARD ON when ground and polarity are
Proper ground and polarity
OK.
Attempts to fire for 4-6 seconds; then
Display Board LEDs
Controlling Function Possible Cause
Check Breaker
Wiring disconnected
Plugs on module disconnected or
loose
Transformer wiring problem
Transformer is defective
Water temp probe unplugged or
damaged
Vent temp probe unplugged or
damaged
Water in tank is too hot (ECO is
activated). Check water temp in
tank on display board
Vent switch overtemp switch is
open
No or not enough water in tank.
Combustion air blockage
Blower not operating
Air switch stuck open or closed
Temp probe wiring is unplugged
Probe open internally
Probe wiring shorted
Probe shorted internally
Broken or corroded burner ground
wire
Connectors on controlled panel
unplugged
Gas valve shut OFF
Clogged gas valve
Faulty gas valve
Defective control
Gas valve improperly adjusted
No power to blower
Blower is bad
No power to ignitor
Ignitor is bad
System problem on circuit board
Polarity is reversed
Poor or incomplete ground
28
Service Remedy
Turn breaker ON
Check wiring
Reseat plugs on control
module
Repair wiring
Replace transformer
Reseat plugs on control
module
Check connector. Repair wiring
Check connector. Repair wiring
Normal when water gets too hot.
Cool tank. Determine cause for
over temperature.
Check venting for obstructions
Check orifices to insure they match
fuel type.
Press reset button and recheck.
Make sure tank is full of water.
Check intake and exhaust piping
and flue for obstructions
Check and repair blower wiring;
replace blower motor
Replace air switch
Check connector or repair wiring
Replace probe
Repair short
Replace probe
Check wire and connection at
burner
Check and reseat connections
Turn gas valve ON
Replace gas valve
Replace gas valve
Replace control
Adjust gas valve correctly
Check for power to blower
Repair or replace wiring
Replace blower
Check for power to ignitor
Repair or replace wiring
Ignitor current draw is too low.
See ignitor lockout on page 17
Replace ignitor
Press red reset button. If error
occurs repeatedly, replace main
control board
Correct polarity
Ensure adequate grounding to unit
and in electrical circuit