LP-605 Rev. 000 Rel. 009 Date 8.16.18
45
Error Code Description Cause Possible Remedies
E28
Gas Valve, ECO Hot Water
Outlet, ECO Burner Plate, or
Intake / Exhaust Pressure
Switch (APS)
The gas valve has lost power.
1. Unplug the water heater.
2. Check wire connections of the gas valve, thermostat, and
air pressure switches.
3. Use an ohmmeter to check for continuity of the following
items:
a. The thermostat.
b. The intake air pressure switch.
c. The exhaust air pressure switch.
d. The gas valve.
4. Replace the defective item.
E30 RPM too High
DC blower motor is rotating
too fast.
Call for service. Replace the blower motor.
E31 RPM too Low
DC blower motor is rotating
too slow.
E36 Relay Error
Controller failure concerning
the gas valve.
Call for service. Replace the main controller.
E37 Communication Problem
Communication failure
concerning the subsidiary CPU.
E38 Sub RAM Failure Subsidiary RAM failure.
E39 Sub CPU Hardware Problem
Control failure concerning
subsidiary ame signal.
E40 Main RAM Failure Main RAM failure.
E41 Flame Signal Problem
Controller failure concerning
ame signal.
E42 Main ROM Failure Main ROM failure.
E43 Main AD MUX Failure Main MUX failure.
E54 Gas Valve Leak Detected Gas valve failure.
Table 27 - Error Codes and Suggested Corrective Actions
NOTE: In some cases the Error Code may be cleared by pressing the button to turn the water heater OFF, then ON again. If this does not
clear the Error Code, contact your water heater installer for service.
B. Suggested Corrective Actions
Problem Possible Causes Possible Remedies
No electrical power to the water
heater
1. Is the plug on the power supply cord unplugged
from the electrical outlet?
2. Is electrical panel’s 10 Amp circuit breaker
tripped?
3. Is the fuse on the circuit board good?
4. Is there a power outage to the home?
1. Reset the plug.
2. Reset the circuit breaker.
3. If the display panel is blank, unplug the unit
or contact an authorized service technician.
4. Contact the power company.
No water available when faucet is
opened
1. Is the water supply valve shut o at the meter (do
cold water faucets work)?
2. Is the water supply valve near the unit open?
3. Is the water pipe frozen?
4. Is an error code ashing on the display panel
(leak detected)?
1. Open the closed supply valve.
2. Open the water supply valve.
3. Turn OFF the unit, close all water valves and
the gas valve. Contact an authorized service
technician.
4. Refer to error code information and contact
an authorized service technician.
Hot water is not available when a
faucet is opened
1. Does the water heater have power (plugged in)?
2. Is the water heater turned ON?
3. Is an error code ashing on the display panel?
4. Is the gas supply valve open or shut o at the
meter (do other gas devices work)?
1. Restore electrical power to the unit.
2. Press and hold the Power button to turn the
unit ON.
3. Refer to the Diagnostic and Error Codes
section in this manual.
4. Open the gas supply valve.
The water temperature is not hot
enough or turns cold during use
1. Is an error code ashing on the display panel?
2. Is the water temperature on the thermostatic
mixing valve set too low?
1. Refer to the Diagnostic and Error Codes
section in this manual.
2. Adjust the outlet water temperature on
the thermostatic mixing valve (refer to the
procedure in this manual).
To Next Page
Loading...
Need help?
General
