Need help I have a error code 10 on my Hayward heater but I can’t find anything showing that code. Help please
Hayward h400 IDL2 serial 40952002
- Thread starter Vivianaluv
- Start date
“LO” Error Code means Limit Open.
The Version 13 ignition control features revised logic for the “LO” error code.
The “LO” error code indicates that the contacts on one or more of the switches in the limit string are open.
The limit string contains the temperature limit switches (2), the vent pressure switch, and the water pressure switch. If the limit string opens the error code “LO” will be displayed.
There aretwo types of “LO” error (note there is no differentiation between the types on the display):
The Version 13 ignition control features revised logic for the “LO” error code.
The “LO” error code indicates that the contacts on one or more of the switches in the limit string are open.
The limit string contains the temperature limit switches (2), the vent pressure switch, and the water pressure switch. If the limit string opens the error code “LO” will be displayed.
There aretwo types of “LO” error (note there is no differentiation between the types on the display):
It might be as simple as making sure that the water flow is good.
How much water flow do you have?
How much experience do you have working with electricity and gas appliances?
How old is the heater?
When is the last time that it worked correctly?
Do you have pictures of the system?
How much water flow do you have?
How much experience do you have working with electricity and gas appliances?
How old is the heater?
When is the last time that it worked correctly?
Do you have pictures of the system?
Last edited:
Here are the pictures shows code 10 or is it Lo? Not much experience I’ll check the water pressure and let you know thanks for your help
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I'm guessing that it's probably LO.
The heater is really old.
You should probably get it inspected by a qualified professional before trying to use it.
The heater is really old.
You should probably get it inspected by a qualified professional before trying to use it.
I would suspect that is an "IO" code, which points to a possible bad ignitor. 
“Igniter Open” Inspect Igniter wiring, ensure Igniter plug is securely attached to the ICB.
Verify Igniter ohm resistance ( 8-25 ohms between 20°- 140° F).
IO is probably correct.
Verify Igniter ohm resistance ( 8-25 ohms between 20°- 140° F).
IO is probably correct.
