Question about Pentair MASTER TEMP HEATER 400 000 BTU NG LOW NOX HD EXCHANGER

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Master temo heater will not fire and makes bubbling sound

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Car keeps over heating and sputters installed new thermostat flushed coolant what else could it be,sensor?


You need to check coolant circulation and coolant temperature. Also check for active bubbles in coolant even cold. Its possible there is poor coolant flow, poor cooling of the coolant, or the head or gasket have been damaged and are allowing compression to escape into the cooling system and superheat it. This will be seen as greay steaming bubbles floating up in the radiator or overflow tank and popping despite the fact the tank or radiator is full and not that hot, the bubbles will be steam pockets escaping as air and extremely scalding! (Danger!).

The tools Id use are a IR temo gun to check actual coolant temp and possibly temp across the hoses and the radiator itself. Then you want to verify all cooling components (fans, shrouds, thermostat, water pump(s)) are all doing their jobs. If all that checks out and system is full and holds pressure, youll wanna check internal engine leaks making temperature go high.

May 04, 2015 | Cars & Trucks

2 Answers

I have air bubbles coming into the master cylinder fron my 1998 silerado truck what can cause that?


Is the break soft? Probably air got into system during bleed.
Be patient let them come up, Otherwise, may need to bleed more make sure you keep reservoir topped.

Feb 13, 2015 | 1998 Chevrolet Chevrolet silverado

1 Answer

Break line broke replaced no leaks can't get break paddle99 Chevy


Sounds like you may have an air bubble in the master cylinder. The most effective way to deal with that is getting a master cylinder bleeder kit from your local parts store - make sure it has the metal clips that will hold the hoses in the master cylinder. Install line adapters after removing brake lines from the master. top up the fluid in the master and install hose clips, making sure the end of the hoses are in the brake fluid at least 1 inch. Slowly pump the brake pedal, making sure you bottom out the pedal and release SLOWLY so you don\'t suck air into the hoses - have a helper watch the fluid level in the master cylinder and the bubble production. The fluid level should not sink during this procedure - if it does, then you may have a faulty master cylinder. Pump until you have no more bubbles. If the bubbles don\'t stop, then you have a faulty master cylinder.

Hope this helps!!

Dec 01, 2013 | 1995 Chevrolet K1500

1 Answer

Bubbling sound from blend actuator on the heating side


Sounds like the heater core is leaking. might need replacing as well. the bubbling sound might be the pressure of the cooling system exiting through the heater core. Does it smell like coolant inside your car?

Jun 18, 2012 | 2004 Jaguar S Type

3 Answers

Master temp 400 with E05 error message, already replaced stack flue sensor, thermistor, and igniter. Any suggestions?


I have the same exact problem with this unit. Obviously getting gas to the unit, because it runs and pumps out some serious heat for a short time, but then kicks off. Did anyone ever figure this out or did you buy a new heater? :-)

Feb 25, 2012 | Pentair Mastertemp Pool & Spa Heater Dual...

1 Answer

Can you use Handy Master Fire Fan Heater Md#HMF 13 inside?


yes,i have the same one.just make sure it is not pointing at anything an keep it in the center of the room.do not use it as a substitue for your normal hous heating system.

Oct 07, 2010 | Master Heaters Master B115DT 115,000BTU...

1 Answer

New heater core and thermostate /no heat


sound like you have a bubble in the system. make sure you drain all liquid out, make sure the thermostat is the proper temp rating and is not backwards. Fill the radiator up turn the car on turn the heater on full blast fill up the over flow with anti freeze. put the radiator cap on. watch the temp in the car. dont let it get all the way in the red. you should see the overflow tank start to get the anti freeze sucked out of it don't let run dry. I had this problem with my 2004 dodge ram. This is how a master mech told me to do it

Jan 16, 2009 | 1999 Dodge Intrepid

1 Answer

Pro-Temp forced air kerosene heater


my heater had a filter made out of copper that looked like a bubble stone for a fish tank. I forced compressed air through it and put it back together and it worked great

Jan 15, 2009 | Heating & Cooling

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