Polaris Water Heater error code 1, also known as the Pressure Switch Closed failure.
The Polaris Water Heater has an onboard diagnostics system that will flash a red LED to indicate a fault. This LED is visible through a small window on the access panel near the bottom of the hot water tank. By referring to the Polaris manual, you can discover what each of the error codes mean and there’s also a nice flow chart that suggests what to check/fix.
Error code 1 indicates that the pressure switch has failed to close. What this means is the Ignition Control Module (ICM) is unable to test if there is fresh air coming into the Polaris water heater. Without fresh air, there can be no combustion.
Now, the flow chart in the user manual basically has one solution for error code 1 – replace the pressure switch. While that may be the final solution required, I’ve had a service technician from Direct Energy tell me that you should also check everything associated with the Polaris Water Heater Error Code 2 problem. I recently had this issue and the problem turned out to be a small piece of dirt had become lodged in the air inlet to the pressure sensor. Likely this bit of dirt was picked up from outside, through the air inlet pipe and worked its way into the valve.
Once the technician remove the clear PVC pipes, removed the bit of dirt and reconnected everything the hot water heater came back to life. He also mentioned that on newer Polaris water heaters there is an external air filter on the 3″ air inlet pipe so that small bits of dirt don’t cause issues like this.
So, if you currently have error code 1, try checking for dirt in the pressure sensor valves before making that expensive service call.