Hey TFP Folks,
Setup: 22K gallon Gunite pool and spa with Anthony DE filter, age about 15 years;
PentAir WhisperFlo pump, age 2 years;
RayPak RP2100 gas heater with electronic ignition, original to pool;
Anthony Pools Antho-Touch 2040 indoor control panel, allows switch from pool function to spa function and pool heater function to spa heater function, also original.
Problem: pool heater comes on but won't heat pool
Symptom: pool heater cycles on one time only, either when entire system is first started up or if heater switched off at indoor panel or outside switch box, and then back on again. Will stay lit for a while and cycles off, but never cycles back on again unless heater or entire system switched off and back on. Then it will light once, run, and cycle off, never to re-light on its own...
Clues that I'm not sure how to use: 1. If spa switched on and function set to "Spa Heater" (on indoor panel), heats spa just like normal and holds any spa temp. just fine.
2. The indoor panel has dual notifier lights for both the spa heater and the pool heater function. The first light tells you power is on to that function, the second light comes on to tell you it's in a "heating" cycle -- that is, second light comes on only when burner is lit. Of course the spa heater lights are working, just like the spa heater function. But -- both "pool heater" lights also work just like they're supposed to! If you move the little sliding temperature selector on the indoor panel, the second light comes on when you select a setting above the ambient water temp. and goes off again if you slide it to a setting below the temp.
It knows when to turn on the blasted notifier lights, but won't turn on the pool heater burner!
Techs from three different pool maintenace cos. have come out. They all three turned the thing on, noticed that the burner lights, and told us it's working fine. No help there, not yet anyway...
Thank you in advance for reading this post and wading through all the details. Any help with troubleshooting or repairing is appreciated a lot!