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Okay, that's fair, as it will result in more pressure being available to the heater as a result.

Okay great, thanks @cptkirk, will pull the filters out after work today and give it a try. The elevation of the heater relative to the pool @JamesW is no more 2'-6". It has been running for about 6 years though so don't suspect this represents a challenge unless you had another perspective...

I will try pulling the filters out to see if still throws the LO error code.

There seems to be a good flow going into the pool so it doesn't visually appear that the filter is causing a restriction.

I increase the speed up to about 2380 rpm to 2420 rpm. I haven't changed the filter cartridges for a while and there currently is a 10psi pressure showing on the gauge on the top of the filter.

Thanks so much. I just posted one. :)

I own a Hayward 250FDN Pool Heater and it starts intermittently. When the heater is cold I increase the flow rate on my pump as it is variable speed drive so that the LO flow error code clears. Once the low flow (LO) error code clears I switch the main panel from Standby over to Pool heating...

Am an owner of an Hayward 250FDN Pool Heater and having a few challenges with it.