Welcome to our forum.
silly question but have you taken the circ pump filter out?
I get this question all the time on the smaller tubs with the 1000 watt heater. The answer is: balance the water, be sure the filter is clean or new, close the lid and don't open it again for 20 hours. You should not feel any heat coming out of the jets, and four hours with you opening and closing the lid is not enough to even start the heating.Chances are it will be hot before then, but if you set your mind on 20 hours you will not be tempted to keep checking the thing.Is this a new to you tub?Tub is not new to me. It was working fine but then one day it is hot the next day luke warm. After four hours I should be able to tell by the thermostat if it is getting warmer shouldn't I?I have a two piece hard cover and only opened it after four hours but I know it wil take longer than that to get a noticable change.
Is the pump running @ low speed?Leave filter in.
Spa will heat VEEERY slowly. The only sure way to know if heater is working is to measure the amp draw with a clamp on amp meter. Should be around 13 amps, if not, bad heater.
I took the filter out (appeared to be clean) but once I saw I had 120v going to the pump I put it back in. Should I leave it out as well for 20 hours?
I have a clamp on probe at work I will borrow tomorrow and check current flow. From what I calculate I should get about 8.3 amps with a 1000 Watt unit at 120 volts.
That is correct.
If this is a digital thermostat - what do you have it set for?Should be ut1 or ut2 if you want 105 8-)