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Air flow works gas heater will not come on after replaced filters

What is the procedure having the heatert kick on?

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Put the thermostat on heat and set it at about 65 degrees or so and it should do the rest

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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MasterTemp 400K BTU heater kicks on for 20sec. and starts shaking, then turns off and repeat itself. Everytime it kicks on we smell gas as well. Water flow seems to be OK in spa and pool.


Even though you are smelling gas it could mean the gas flow is not strong enough.
When you say the water flow seems good, have you cleaned your filter recently?

If you are somewhat handy you can troubleshoot this heater by taking off the front panel turning it on and looking up to the back of the circuit board.
When it shuts off it will have red lights next to abbreviated words such as hl1 hl2.

Whichever light or lights are red will point you in the right direction of the cause.

Mar 27, 2017 | Pool & Spa

2 Answers

Display says "CFH" but heatert wont fire up. Just makes a clicking sound


You don't have gas supplied to the heater. It sounds like you have a gas powered unit and the clicking you're hearing is the sparker sparking.

Jun 07, 2015 | Pool & Spa

1 Answer

When i turn on my spa and heater it states on the outside unit "no air flow" and it won't heat up


that is usually an indicator of water flow not the air flow.
What does the hot tub do when you turn the breaker from off to on?
does it run through the purge cycle?
is it kicking out the GFCI?
if it is not tripping the GFCI then you most likely have either too little water flow for the heater to kick in or not enough water flow to activate the heater.
Try taking out your filter and see if that solves the issue.
you may also have a bad temp sensor if the tub just runs and runs but never heats up.


Rod
US Parts Center
888-521-6183

Feb 08, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Jandy lt250 heater has air flow message


make sure 24 volts ac on both sides of pressure switch if not replace pressure switch or copper tube is plugged if only 10 or so volts will not keep gas valve open

Nov 21, 2012 | Jandy Laars Lt 400,000 Btu Heater

1 Answer

My furnace kicks on, runs a little while, kicks off, then kicks on again until desired temperature is reached


it could be the thermostat on the wall not working or the fan control is not working as it should also check to see if air filter is blocked

Oct 24, 2010 | Dayton Gas Furnace Heater

1 Answer

The heater is only kicking on low as the wate demand goes up the temperature of the water drops because the heater is not kicking up like it used to. The heater is a little over a year old.


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-Tankless water heaters are susceptible to lime build-up if not de-limed each year.
-Hard water will clog pressure-sensor and cause failure within 2 years if filter and softener are not working.
-Water flow and water pressure sensors inside tankless are succeptible to hard water deposits.
-Low water pressure from clogged pipes to municipal water problems to water well pressure valve can affect tankless burner
-Low-flow shower heads may not engage burner.
-With tankless-gas water heaters, sensors inside combustion area detect when incoming air flow is not adequate ... inspect inflow
-Your manual probably has a troubleshoot section.
-The manufacturer will refer you to installer.
-If you self-installed unit, that will void warranty to my understanding.
-There are water heater forums 1 2 3 4
-There are plumbers who will each have a different opinion
-There are Fixya experts who get paid to tell you the above.
-And there are local plumbers who are authorized dealers of the brand of tankless who get paid to fix them

Oct 07, 2010 | Rheem Tankless Hot Water Heater...

3 Answers

PILOT LIGHT KEEPS GOING OUT.


If the pilot flame is weak, when the main burner is ignited, there can be enough 'whoosh' of air and gas to blow out the pilot. There may be a little of grit in the pilot valve jet hole restricting the flow, hence the weak flame. Try using a piece of fine wire to clear the obstruction. If that does not help the pilot jet will have to be unscrewed and cleaned with compressed air. Ensure the gas is turned off before attempting any maintenance.

Sep 13, 2010 | Reliance Water Heater #6-40-GBRS 40GAL...

1 Answer

DESA Propane Heater Valve Apart


Do,not override the safety features on any units unless youre qualified. These are not overides ,but safety switches to tell when something is not right! Anyway, its time for a fall service overhaul or kit ---plug---fuel filter---2 air filters --clean the flame sensor---and vanes in the pump replaced.You can buy the kit and parts that you need a your local lawnmower repair shop or have them to order them!

Dec 14, 2009 | Desa International Propane Portable...

6 Answers

Larrs lite low knox ten years old fires for seven seconds.three times than goes into ignition lockdown.new fire sensor installed didn't solve the problem. gas flow adequate, could it be bad gas valve? ...


Are you sure that the flame sensor is installed correctly? If the flame comes on and the flame sensor is right in the flame, then the control module is not working right. It's not 'seeing' the flame sensor input. You can prove it by jumper across the contact wires on the flame sensor. If it stays lit when you jump out the sensor, it's not working. The flame sensor tip needs to be right in the pilot flame to sense heat.

Aug 29, 2009 | Teledyne Laars Laars Lite 2 Pool Heater...

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