Munchkin

Paul Rohrs

F05 - Supply temp is to high. Occurs if supply temp goes above 230F. Check flow issues or is t-stat is continuously energized. (Reset w/ S4)

I would check the circulator wiring, I have seen it where loose connections gave me intermittant pump operation.

Regards,

PR

Biggerstaffradiantsolutions.com

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Jamie_6

I do not have a manual on me does anyone know what a F05 is?

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hr

A stuck circ?



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[Deleted User]

Generally speaking...

IF you're firing that low mass pup with no circulator, your sphincter should tell you there is a problem...

Every time I fire one with no circulator, my sphincter does the momba as the boiler scoots across the floor doing the low mass boogie. My brains telling my feet to run, but my heart is looking for the kill switch.

I'm headed out at 4:00 AM to INTENTIONALLY get a boiler to do a controlled low mass boogie. It's a snowmelt system with leaks. Have to keep the fluid hot and pressurized, but not normally circulated to "see" where the leaks are at using s FLIR Infrared camera. I'll be parked at the gas valve of the boiler, doing a manual control job to keep that 1.5 mill beast from blowing a tube. My sphincter is already practicing the momba just thinking about it...

Intermittent sticking pump would be my guess, or possibly a bad wiring connection.

ME

Alan(OnVacationInOregon)Forbes

More like

intermitteent sticking sphincter; I'd have that looked at.

Chuck Shaw_6

Manual

Jamie,

I e-mailed a copy of the manual. If anyone else needs it you can download it here.

http://www.htproducts.com/literature/lp-61.pdf

Hope this helps,

Chuck Shaw

steve_28

coincidentally our munchkin is doing the same thing

Had a new munchkin installed, fired up this afternoon by our contractor. It puts out the same F05 code and then locks out...we have determined that the control is not supplying voltage for the boiler pump when we hardwire the pump to energize it the boiler will fire and start and then after awhile it will supply voltage for that circuit, but not all the time. It isn't a loose connection type voltage issue, because it is almost like the boiler goes into a different mode and starts to supply voltage and may ramp up to a different temp and then quit supplying voltage. Anyone have any ideas? Our munchkin is a T80 w/vision I controls. I am trying to do a little leg work for my contractor.

Guy_6

Wiring

The issue resides somewhere in the wiring. Fortunately you can diagnose this easily by simply disconnecting a few other wires:
Start by disconnecting one of the two green wires to the outdoor sensor. Any better?

If not, disconnect one of the light blue wires to the indirect sensor.

These two simple moves will make the boiler a simple, one temperature, heat only boiler. Whichever move solved the problem is the direction to look into further.

KEEP IN MIND that connecting the two GREY wires (TT) are what will ultimately energize the heating circulator, which should be wired to the brown and orange wires.

Call HTP at 800-323-9651 EXT 125 and the tech dept will walk you through.

steve_28

wiring ?

So what you are saying is that it is probably either the outdoor sensor itself or the indirect sensor?

Guy_6

Not

Not necessarily either of the sensors, as they are simple and incredibly durable. By disconnecting them you are simply eliminating that aspect of the controlling. When the diagnosis points in a certain direction, you can focus there. You will PROBABLY find that the solution is simple.

Make sure that the main (CH) circ. is wired to the brown and orange wires from the Munchkin control.

steve_28

munchkin problem

The only thing that I know that is non-typical of the way we have it hooked up is we are not finished with the piping for the domestic side, we've got it valved off to that point. But we have the sensor hooked up to an empty tank, I am wondering if that could be throwing off the control some how?

Guy_6

Absolutely

The boiler is trying to make hot water, yet it can't. The HW circ is running with no load on it, hence the F05.
Disconnect one of those blue wires until you get a water load.

clammy

FO5 fault code got i t

If your unit is going off on fo5 which is supply temp to high it may as for iu haved this happen on 3 munchkin units it is because you have to set a post purge time on the 925 controller because what is happening is the residudal heat in the exchanger is setting the supply limit off .On the 925 controller go through the function list on the program and set function #6 to 3 min at a minuim and that should stop that code from appearing by shutting the gas valve off and contuining to run the pump till the heat exchanger cools down .Had this appear on a munchkin that6 was in for over 1 year and then it started to code f05 also i did as i mentioned above and all was fine have not been back for it again it would probably be wise to due the same for the heating pump also that function is 13 but keep in mind that with zone valves you would need a by pass other wise the pump may dead head depending ofn how youy piped it peace and goods luck clammy

Unknown

I agree that the DHW issue is the most likely culprit... post back afterwards steve and let us know how it goes!

steve_28

The \"Munchkin\" LIVES!!!

We unhooked the indirect sensor and the boiler fired right up without a problem. There was power to the boiler pump, it has been working perfectly since 10:00 AM this morning. Much to our relief!!

Thanks for all the replies.

Craig Bergman

Wow!!!!

> Paul is 100% correct!

>

> You have no

> class.

>

> Moron.

>

> Mark H

>

> _A

> HREF="http://www.heatinghelp.com/getListed.cfm?id=

> 238&Step=30"_To Learn More About This

> Professional, Click Here to Visit Their Ad in

> "Find A Professional"_/A_