Aqua-hot won't start

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Aqua-hot won't start

December 28, 2019, 06:39:44 pm

I was trouble shooting the coil and it would work and then not work and then it started working steady. Put it back in and it wouldn't
fire up. I set it up so I could see if power was coming out of the box and it was. I checked an I have fuel coming out of a new nozzle.

Re: Aqua-hot won't start

Reply #1 – December 28, 2019, 06:48:14 pm

One test of the coil is to fire it 100 times. If it fails any firing, replace. But, an intermittent coil may very well pass this test.

Be sure point gap is correct. If points are to high, they will fire into the swiller deducting in good coil test but no ignition of the fuel.

Re: Aqua-hot won't start

Reply #2 – December 28, 2019, 08:27:49 pm

Quote from: oldguy – December 28, 2019, 06:39:44 pm

I was trouble shooting the coil and it would work and then not work and then it started working steady. Put it back in and it wouldn't
fire up. I set it up so I could see if power was coming out of the box and it was. I checked an I have fuel coming out of a new nozzle.

Check the snap disc thermostats and limiters.. probably have one out

Re: Aqua-hot won't start

Reply #3 – December 28, 2019, 08:38:40 pm

What is a snap disc limiter?

Re: Aqua-hot won't start

Reply #4 – December 28, 2019, 09:44:56 pm

Quote from: Rudy – December 28, 2019, 08:38:40 pm

What is a snap disc limiter?

The thermostats on the side of the aquahot the round ones.. 198 degree usually sold as a blue dot or red dot depending on what you need temp wise.. they are a simple snap disc limit thermostat set at a certain degree and open or close as needed for degrees..

The limit is the 230 degree and the thermostats are the 198 or they can both be a self resetting limit thermostat.

Sample aquahot part
Thermostat, AC Control, RED DOT

Typical resetting limit thermostat .
Snap Disc Thermostats, Preset Temperature Switches | Senasys
Any flavor that is needed..

The aquahot thermostats are normally closed NC

so when they hit the set degree they open and it shuts the aquahot down till they hit the lower set degree..

Limits on the aquahot are a non resetting limit on the 230

Samples
Snap Disc Thermostats, Preset Temperature Switches | Senasys
Selco - SE-L200 - Thermostat; Disc; 120/240 VAC; 25 A; SPST/SPDT; 1500 VAC...
Selco - SE-L230 - Thermostat; Disc; 120/240 VAC; 25 A; SPST/SPDT; 1500 VAC...

Hope these help

Re: Aqua-hot won't start

Reply #5 – December 28, 2019, 09:53:53 pm

There is 4 thermostats in the space. 2 electric and 2 for diesel. I haven't seen any snap discs. It could be the points as someone lost the point gauge and I'm guessing where they should be. The clamp that holds the points in place had been bent and I had to straighten it so the points where in the right place. I need to get the gauge. I've been learning a lot about the Aqua-hot as I didn't know a thing about them a month ago and there is a lot more to learn.

Re: Aqua-hot won't start

Reply #6 – December 28, 2019, 09:57:00 pm

I just looked at the picture of the snap disks and that is what I have and there is continuity though them all.

Re: Aqua-hot won't start

Reply #7 – December 28, 2019, 10:58:45 pm

Just asking but you did disconnect the wires when testing? Take out any other possibilities?

Re: Aqua-hot won't start

Reply #8 – December 29, 2019, 12:40:39 am

Learn something every day, never in 10 years had any person call the control and high limit thermostats "Snap Discs".

His description of the problem did not suggest a failed thermostat.

Re: Aqua-hot won't start

Reply #9 – December 29, 2019, 04:54:55 am

Quote from: Rudy – December 29, 2019, 12:40:39 am

Learn something every day, never in 10 years had any person call the control and high limit thermostats "Snap Discs".

Same here. I had to Google it to learn more about snap disc...bi-metal thermostats

Re: Aqua-hot won't start

Reply #10 – December 29, 2019, 09:57:29 am

Quote from: DavidS – December 28, 2019, 10:58:45 pm

Just asking but you did disconnect the wires when testing? Take out any other possibilities?
[/quot
You mean take the wire off the thermostat. I didn't do that.

Re: Aqua-hot won't start

Reply #11 – December 29, 2019, 10:17:36 am

Quote from: Rudy – December 29, 2019, 12:40:39 am

Learn something every day, never in 10 years had any person call the control and high limit thermostats "Snap Discs".

His description of the problem did not suggest a failed thermostat.

When mine went out last week it had the strangest symptoms.. acted like the box quit working.. then the coil would fire but sounded weak. Then a no fire at all.. turned out to be the thermostats.. blew a high limit.

Glad I was able to help educate but I can't take all the credit as I am not they smart but learning everyday. My friend explained what they were and how they worked.

Re: Aqua-hot won't start

Reply #12 – December 29, 2019, 10:35:13 am

Good catch David. Please know the coil is not on the high limit thermostat circuit. But the fuel solenoid is on that circuit. Open High Limit thermostat equals no fuel, no fire.

Re: Aqua-hot won't start

Reply #13 – December 29, 2019, 08:48:13 pm

What makes the make and brake in the circuit for the coil to spark. When I was testing them when they didn't work, if I made a
braked the jumper I was using I would get a spark each time I made and broke the circuit. Then I would hold the jumper and some
times I would get a spark.

Re: Aqua-hot won't start

Reply #14 – December 30, 2019, 03:30:05 am

The Control Unit energizes the coil as it energizes the fuel solenoid 20 or 30 seconds after starting the burner motor. If the flame sensor reports a fire, Control Unit turns coil off but leaves fuel on till Control Thermostat opens or ON/OFF switch is turned OFF. Either event causes the Control Unit to turn the fuel off and run the burner motor for about 2.5 minutes to cool things down and then turns burner motor OFF.

Re: Aqua-hot won't start

Reply #15 – December 30, 2019, 08:35:30 am

Rudy,

My unit will fail to fire. I replaced the nozzle and filter. If worked for 7-8 times in a row with daily testing, then stopped firing reliably.. Fuel dips out the exhaust (small amount). It will fire occasionally, and make a bunch of white smoke. So if I understand you, I can rule out the high limit thermostat, because I wouldn't be getting fuel, right? What's next?

Re: Aqua-hot won't start

Reply #16 – December 30, 2019, 08:59:48 am

Rod, You are correct, high limit thermostat is good if you have fuel.

Fuel and no ignition suggest coil or control unit not firing coil. This assumes new nozzle and correctly spaced igniter points.

If you have the black plastic Sperios Control Unit, many of them have been problems. Original silver box from 2002 may be near end of service life of the relays.

All the best sorting it out

Re: Aqua-hot won't start

Reply #17 – February 10, 2020, 08:46:45 pm

I've got it starting great now and the only problem with it is it will shut off. The light will be off and I shut the switch off and turn it back on it will start up fine. This is a problem it had when I first brought it home and it got harder and harder to start back up until
it wouldn't. The biggest problem was the igniter points were way out of adjustment. The only thing I feel is amiss is when it's running
I will here a murmur or a slight hesitation. I have never seen it shut down so it could be in a start up. Any ideas would be appreciated.
It's really hard to trouble shoot when it starts right up.

Re: Aqua-hot won't start

Reply #18 – February 10, 2020, 08:54:31 pm

Typical control box symtom. Eventually turning it off and back on will no longer get it to start back up.

Re: Aqua-hot won't start

Reply #19 – February 10, 2020, 09:15:33 pm

New control box.

Re: Aqua-hot won't start

Reply #20 – February 10, 2020, 09:48:34 pm

Need Rudy's input on this one if your box is new. The black plastic boxes have been known to not work.

Re: Aqua-hot won't start

Reply #21 – February 10, 2020, 10:06:18 pm

Quote from: craneman – February 10, 2020, 09:48:34 pm

Need Rudy's input on this one if your box is new. The black plastic boxes have been know to not work.

Aquahot makes there own box now.. 2 models.. one older and a newer one

WPE-300-900 old

WPE-300-901 New (I believe)

Re: Aqua-hot won't start

Reply #22 – February 10, 2020, 11:21:51 pm

My "black" box on my aqua hot died in December. I installed a new state of the art Aqua Hot box in mine. Don't know the part number.
Rudy will be the man to talk to

Re: Aqua-hot won't start

Reply #23 – February 11, 2020, 12:16:08 am

Quote from: hdff – February 10, 2020, 11:21:51 pm

My "black" box on my aqua hot died in December. I installed a new state of the art Aqua Hot box in mine. Don't know the part number.
Rudy will be the man to talk to

Did the plug have to be modified?

Re: Aqua-hot won't start

Reply #24 – February 11, 2020, 01:26:26 am

No. The only difference is the plugs are on short wires instead of being directly on the box

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