2000 Hot Springs Grandee - doesn't heat

[pearlbell]

Current Symptoms:
 1) All jets work.
 2) Recirculation pump works.
 3) Light works.
 4) Heat replaced several years ago with new style Titanium PDR 6kw.
 5) Red light comes on steady.
 6) Control panel temp button would not increase set point temp but would
     decrease it.     
 7) Outlet water did not feel hot.
  Both thermistors measure ~ 8 KOhm resistance.
 9) Heater resistance measures ~ 30MOhm.

I think the next step is to replace the controller box (P/N 37293) behind the front panel. I can't find it new online but did find one used for $39.  I have not talked to the dealer yet. 

Questions:
1) What else should I check & how should I check it?
2) Where can I find parts?
3) Is there another forum that would be useful for learning how to debug this problem?

Thanks!

 


 

[goneaway]

How long did you leave it running ?
I can honestly say that i cannot feel any difference in temperature when my heater is on.
It takes about 1 hour to increase by 1°C

[pearlbell]

It ran overnight but did not heat.
I can tell the difference in the inlet and outlet temperature with my hand when  it is working.

I suspect the controller.

Does anybody know the proper resistance for the thermistors or the heater?

thanks

[Dr. Spa™ Ret.]

Heater's bad. The Red light typically means it's getting power. 30M ohms? What's the "M" (thousand?)? You should be around 15 ohms

[goneaway]

What voltage are you on ? 110 - 230.
I think i remember a few formulas to work out resistance and amps etc.

In the UK we are 240v, i work this out that the heater pulls around 25 amps, which equates to around 10 ohms resistance.
As Dr Spa mentions, 30m ohms is far too high a resistance.