I have an older Catalina Hawaiian with a Acura Power Station pack and a Gordon Digital Topside 4 button controls. My problems are that when the primary pump is running on low or circulation mode the heater light is not on nor are the topside control lights, but if i turn the jets on all the lights come on. Any ideas? Thank you.

Low flow from a clogged filter or pump impeller, or an out of adjustment pressure switch.

Removed filters, flow is same as it was before (pretty strong on low), jumped pressure switch (no change). Thanks for the help.

Also would any of those affect the lights on the topside controls (temp & heater)? Thanks again.

Has it been worked on recently?
If it's a 110v model, or 30amp 220v, maybe someone inadvertently reversed the high and low speed pump wires.

No. It was only winterized, no wires were moved just drained all water. I'm thinking it might have something to do with the electrical side of the air switch that operates the primary pump. I ordered one, I'll keep you posted.

Well replaced air switch and pressure switch, same results. Heater and display lights only come on when primary pump is on high. Any other ideas????????
Thanks.