IKONIC Tankless Water Heater Service Manual
60
ERROR CODE DIAGNOSTICS
ERROR A090
EXPLANATION
Detected Blockage in Venting
If the water heater detects a blockage in the venting, the
water heater displays the “A090” error code on the User
Interface.
Diagnostic check items
• Venting
• Air lter
• Gas inlet pressure
Check method
Venting
Check the condition of venting (Exp. The connections of
vents, the vent termination) If the connection of venting
is removed or the vent is blocked by something, recon-
nect the vents or clean the vent (Both inlet side and ex-
haust side)
Refer to section “Venting for direct vent water heater” in
this manual and refer to U&C manual for installation in-
structions.
Air lter
Check with the air lter at the inlet air connection of the
water heater. Ensure the lter is not blocked by some for-
eign substance.
If the air lter is blocked by something, clean the air lter,
and remove the cause.
Gas supply pressure
1. Check the gas supply pressure at the gas connection
of the water heater.
The correct gas pressure are below;
• Natural Gas (NG); 4.0”-10.5” 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 the dy-
namic pressure.
• Static pressure : Gas pressure during standby
• Dynamic pressure : Gas pressure at max combustion
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