Rheem HE119-199LP, HE45-160LP, HE45-130N, HE45-100LP, HE45-100N, HE45-130LP Green LED on Main

Display Board LEDs

What they mean, controller functions, possible causes and suggested service remedies.

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

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