Hello and thanks for all the good troubleshooting information on this board.

I have a 2005 Tiger River Bengal 240v (6KW heater) that is having problems of late.

First I noticed water dripping out of the Ozone unit. The check valve had failed and the unit was burned out.
I had recently done a drain and fill and the tub heated up OK.

When I replaced the ozone unit the other day, I noticed the tub temperature was warm (90-something) while it is set for 102 F.

Everything else is working ok - silent flow pump - ozone unit - jets....everything but heat.

This tub has the newer no-fault heater with no reset button. So today I turned off the power and disconnected the heater and checked the resistance going to the heater unit. It measured approximately 10 ohms. I then turned the power back on and measured the voltage going to the heater. It measured only 30 volts or so. I checked the AC lines coming into the terminal block (located on the heater control relay board, and verified that, in fact, 240 volts were coming into the controller).

I purchase the tub when it was a year old, so I have no warranty. The tub has been working flawlessly for over 3 years now.

My question is, can a Watkins heater relay board fail in such a way as to pass 30 volts onto the heating unit? (I was guessing all or nothing).

Thanks for any and all replies.

Yes, the heater board is bad. They always read a low voltage amount like 15-30 volts when they have failed.

Thank you Dan.

HI;
I have a similiar problem with my spa. I have a Balboa Lite leader Circuit Board. S/N 54115. I recently noticed the spa wasnt heating properly. As I took the cover off of the control unit,I noticed a small spark coming from one of the heating relays. I turned the power off and used some contact cleaner on the heating relay. Worked great for about 2 weeks,and I did the samething today on it, (it was acting up ) so far so good. I noticed on Spa Depot that they have replacement relays for my board. Just a question,the new relay is about $10..00 the whole circuit board to replace is $133.00. I was thinking replacing just the relay. Are the relays soldered to the board?
Are the low voltage coils also getting there power from behind the board? I dont see any wires going to the coils ( low voltage )from the front,just the wires ( 240 volt ) that goes from the relays to the heating element. Everything works great,but when the relay starts acting up,it only affects the heating of the water in the spa. I know I have to either change the relay or the entire board.Any suggestions?
Thank you in advance!