I have a hotspot HOTSPRING spa pool.circa 2000 not heating

Domestic Central Heating, Dodge Caravan, well pump or a Pool Heater, or something else.

All questions need 'make model (what it is)' as first 3 words.

With the exception of the Dodge Caravan, pumps have a small bleed screw.

Google

make model bleed pump

or if it is an above ground well pump

make model prime pump

This is heavily weighted towards vehicles, but you will get the ideal of the power of Google!

https://www.google.com/search?q=%E2%80%8Bmake+model+bleed+water+pump

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Pool and Spa heater? The pump has failed? It is only heating the water within the unit.

https://www.google.com/search?q=Hayward+H+Series+Millivolt+natural+Gas+water+heater

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Yes....the relay has to engage. If it is bad then it wont work.

V = L x W X H
2700 = 10 x 10 x X
2700 = 100 x X
x = 2700/100
x = 27

You should be able to do that in your head.

I think you can get a manual from Sears as they still sell these. I'd also contact the owner- they may have stashed it someplace you haven't looked.

when using the aqualink make sure heater is in tstat mode if not for your heater then turn heater all the way up make sure the wires are connected to pool and com then make sure the wires 5and 6 are connected to the heater then the aqualink will command heat if the red light is lit on controller

1) Not likely the timer is problem, unless there was fire or overheating in timer box. Use nose and eyes to inspect for signs of high heat.

2) Eliminate timer as suspect:
Move wires on timer to test if timer relays have gone bad.
Move terminal 4 to terminal 3
Move terminal 2 to terminal 1
http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html#T104

3) Check watt rating of Hayward pump, and voltage.
1Hp motor at 240Volt draws 8 amp, and can draw 6 to 8 times that amount when starting. Up to 100 feet, should be at least 12 gauge wire and double-pole 20 amp breaker. Over 100 feet, 10 gauge wire and 30 amp double-pole breaker is best.
http://waterheatertimer.org/Color-codewire.html#motor

4) Intermatic T104 240V timer is rated 40 amps
Can safely handle 1 Hp motor without nearing heat-rating capacity of timer

5) Make sure the motor is wired correctly for 240Volts.
If motor is wired for 120, and 240 is applied, then tripped breaker can result.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Maybe more than 1 problem: Suspects are: crossover, sediment or assorted gunk is built up in bottom of tank, or a loose wire or bad circuit breaker, or loose connection somewhere at water heater.
There is no off-peak setting unless you wire up the water heater differently or install a timer.

1) When water is cold, open TP valve at hot water heater to see if tank has hot water.
If tank has hot water, but it does not arrive at faucet, then suspect is crossover:
http://waterheatertimer.org/Crossover.html

2) To test if circuit breaker is problem, move wires to different circuit breaker with same amp rating:
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/How-to-replace-circuit-breaker.html

3) Turn off power, open connection at top of heater and check that wire nuts are tight
Check all wire connections for signs of high heat and burning.

4) If bottom is filled with gunk, the lower part of heater can be slow to heat and will take so long that top part of heater will cool. Clean sediment out of tank.
http://waterheatertimer.org/How-to-clean-sediment-out-of-water-heater.html

Do you have power to the heater?If you do then I would look for a hi limit switch to reset.It might be the pump you have to reset.