IKONIC Tankless Water Heater Service Manual
42
ERROR A012
Venting
Check the condition of venting (Exp. The connections of
vents, the terminal vent top)
If the connection of venting is removed or the terminal
vent has a blockage, reconnect the vents or clean the
vent (Both inlet side and exhaust side)
Refer to section “Venting for direct vent water heater” in
this manual and refer to U&C manual for installation in-
structions.
Flame rod (Flame is visible)
Go to "STATUS" mode and use the “▼” or “▲” to "Tank-
less Status", and press "ENTER".
Use the “▼” or “▲” to “Flame Rod Status” while the unit
is operating.
WARNING: When cleaning or replacing the flame
rod/igniter rod, you must replace the gasket with the
Rheem approved gasket (a spare gasket is provided
with the unit). Improper sealing of the flame rod/igniter
rod due to a damaged or missing gasket can cause
unsafe operation or damage the OHL.
ERROR CODE DIAGNOSTICS
Turn Power OFF
Remove connector "H" and terminal on flame
rod, and reinsert them.
Remove & reinsert connector "C".
Operate unit again.
If A012-Error code appears
Check gas-air ratio valve and
solenoid valve.
Replace Solenoid Valve
Check resistance to #5 (black) and
#3 (yellow) on connector "C"
Is the resistance between
0.8k Ω - 2.4 Ω?
Check DC voltage to #5 (black) and #3
(yellow) while unit is operating.
Is the voltage between 90-120 DCV
Check AC voltage to #2 (black) and #6
(white) while unit is operating.
Is the voltage between
108-132 ACV?
Flame rod needed to be cleaned
and is OK.
Turn gas ON and check for normal.
Remove and clean flame rod.
Reassemble it, and operate unit.
Replace Flame Rod.
Does Error A012 persist?
Replace control board.
Is the flame rod
detecting flame?
Is error code
"A012" appeared?
No
No
Yes
Yes
Yes
No
No
Yes
Replace gas-air ratio valve
Yes
Check resistance to the connec-
tor of the white Solenoid Resistor
clipped to the heat exchanger outlet
pipe.
Is the resistance 313 Ω - 347 Ω?
Replace the resistor.
Yes
No
No
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