Rheem IKONIC RTGH-S11i Training And Service Manual page 45

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A011 ERROR CODE
Flame Not Detected From Flame Rod.
In the case of ignition failure, the water heater will at-
tempt ignition 10 times (Including the post purge every
3 times).
If no flame is detected, the water heater displays the
"A011" error code on the Liquid Crystal Display (LCD)
on the User Interface.
Diagnostic Check
• Gas supply pressure
• Gas filter
• Air filter
• Venting
• Igniter rod
• Flame rod
• Gas air ratio valve
• Solenoid valve (SV)
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IKONIC Tankless Water Heater Service Manual
Check Method
Gas supply pressure
1. Check the gas supply pressure and regulator at the
gas connection of the water heater.
The correct gas pressure are below;
• Natural Gas (NG); 4.0"-10.0" W.C
• Liquid Propane (LP); 8.0"-13.0" W.C
2. While the static pressure is normal, the use of an-
other gas appliance may cause a possible drop to
the water heater. Therefore, it is required to check
static and dynamic gas pressure.
• Static pressure: Gas pressure during standby
• Dynamic pressure: Gas pressure at max combus-
tion
Gas Filter
Check with the gas filter at the gas connection of the
water heater that filter is not blocked by some foreign
substance.
If the gas filter is blocked by something, clean the gas
filter and remove the cause.