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HOW DO YOU CHANGE THE CIRCUIT BOARD ON A MR. HEATER BIG MAX MHU75 NG

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 2461 Answers

SOURCE: i have a 75,000 btu mr heater and the spark

Hi clean the flame senser blow the dust out of the heater check the fan switch might be dusty jump out pressure switch see if that helps

Posted on Feb 02, 2010

  • 2461 Answers

SOURCE: I'm looking for replacement parts

try national energy they are on line

Posted on Sep 08, 2010

  • 308 Answers

SOURCE: how big of a breaker

It looks like a 15 amp breaker would be fine, here is the spec sheet
http://shopfnc.com/pdffiles/mhu45spec.pdf

As you can see the unit only pulls 3 amps.

Hope this helps

Posted on Nov 17, 2010

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1 Answer

Mr Heater ignition constantly on. Circuit breaker trips.


I s this spark ignition ? if so check out the igniter see if it is cracked ,it should send a signal back to the box and the stop sparking

Dec 17, 2016 | Heating & Cooling

2 Answers

The code CE is showing on my Hayward pool Heater what does that mean and can I fix it


I have just repaired my H400 series pool heater from the 3rd CE error in only 3 years since the pool and heater were installed. In each case the circuit board (F0059-456600) was in some way to blame .... I will explain.
Case 1 : Only months after installation the CE error came up. Rain water had got in around the display module and water-damaged the circuit board. It was replaced under warranty. Since then I keep a big plastic lid covering the display unit when the heater is not in use.
Case 2 : 1 year from new the CE error came back. On investigation it was found that a rat had managed to get inside the heater (there are big gaps around the pipe entries) - it had then partly chewed through the ribbon cable joining the two circuit boards together. Display circuit board was replaced at my cost - and all was well again. I also rat-proofed the heater - eliminating all the big openings with chicken wire.
Case 3 : Fired up the pool heater for the first time this year and CE came up. I pulled the display module and this time found obvious signs of blackening / burning on the display circuit board under the big green resistor (R1). Luckily I had kept the old circuit board from the previous time and was able to make 1 good board from the two I had - back in action now.
So in my experience it has been the display circuit board each time - and it only takes a phillips-head screwdriver and about 10 minutes to get it out.

Jul 27, 2011 | Hayward 250kbtu Ng Pool Heater - Inground

1 Answer

I have a Big Maxx heater that about 4 months old,and it started to act up, when I checked the circuit board I have three flashes. I removed and checked the pressure switch and that checks out fine, I get...


You may very well be right because if the induced draft motor won't come on then the heatin cycle stops there. It makes me wonder about the board because of it doing the same thing even if it's not calling for heat. Thanks.

May 13, 2011 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Brand spankin' new Master temp 400 NG,won't heat past 77° spa is set at 101°,pool at 88°, does heater pool/spa temps have to be manually set to max(104 i assume) for intellie touch to...


if the intellitouch is properly wired to the heater, it should all be automatic and you should be able to control it all from the remote.

there should be three wires connected to the circuit board behind the manual control on the heater (labeled "POOL", "SPA", "Common"). Those are the wires that the intellitouch uses to communicate with the heater.

You can download manuals from the Pentair website.

www.pentairpool.com

Aug 24, 2010 | Pentair MASTER TEMP HEATER 400 000 BTU NG...

1 Answer

I have a 75,000 btu mr heater and the spark ignition doesnt work . do i have a bad circuit board?


Hi clean the flame senser blow the dust out of the heater check the fan switch might be dusty jump out pressure switch see if that helps

Feb 02, 2010 | Mr. Heater Natural Gas Garage Heater -...

2 Answers

Mr. Heater Natural Gas Garage Heater - 45,000 BTU. Power 120 volt and 24 volt good. Thermostat calling for heat, but nothing happening??


Check for a fuse either in-line or on the circuit board. There should be 24 volts going to the thermostat. If not, you have either a bad transformer or a bad thermostat wire. Jump out the terminals that the thermostat wires are connected to. This should force the unit to fire. If not, bad circuit board.

Dec 23, 2009 | Mr. Heater Natural Gas Garage Heater -...

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