Heating Help

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@ December 5, 2012 3:06 PM in cleaning boiler's heat exchanger coils

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thanks!

@ December 5, 2012 2:59 PM in cleaning boiler's heat exchanger coils

Thanks for the replies. Coils don't look as bad as that photo! Just some dark patches.

I have no idea what they look like on the inside, of course. I know water heaters get calcium deposits from hard water,  but only on the water side, not on the heat side. System is leak-free i.e. holds water pressure for years with makeup water turned off.

Regarding HCl, I did use Rydlyme for a few years (HTP recommends it in the manual).  I have stopped now.  I don't know if it did permanent damage. The HX coil surfaces feel rough to the touch.

cleaning boiler's heat exchanger coils

@ December 4, 2012 5:02 PM in cleaning boiler's heat exchanger coils

I have a Munchkin. I vacuum out the coffee grounds every year and spray CLR.  The inside is clean, except for the stainless steel coils being badly stained especially around the bottom. They have been that way since the early days, when I didn't clean the first year and quite a lot of coffee grounds collected there.

Will scrubbing with Barkeepers Friend take the stains out? Is this a good idea? CLR certainly doesn't affect the stains in any way.

Are the stains a problem for the functioning of the boiler?? Am I worrying about something no one will see and which makes no difference in practice?

fixed it

@ April 23, 2012 9:50 AM in Munchkin 926 upgrade gives F13 error

Many thanks for the reply. It can't be the connection since the error happens with one board but not with the other.

I haven't been checking this thread since the problem is fixed.  I had the board reprogrammed by a local dealer, and the problem went away.

One thing I didn't mention here is that the board arrived with a label "R1 140" (my boiler is a T80M).. The vendor said there is no difference! Then, the board gave a "FLu" error; but the T80M has no flue switch. I jumpered the switch, and then got the F13.

Programming the board correctly cleared all this up.

I will know not to deal with this vendor again.

no water

@ April 18, 2012 12:25 AM in Munchkin 926 upgrade gives F13 error

Thanks for replying! Boiler is not holding water. I vacuum out the coffee grounds and use CLR on it every year.

Any thoughts on the new board F13 error?

additional info

@ April 17, 2012 4:14 PM in Munchkin 926 upgrade gives F13 error

I apologize for opening a 2nd account to post additional info. I cannot log into the old account; I asked for a new password twice but did not receive it.

I wanted to add that the boiler may be 8 years old but it is clean and in great condition.The blower fan runs well with the old controller. It's been tuned up recently with a combustion analyzer.

Regarding the F10 error, the flame sensor is clean, the electrical connectIons are not loose, and the screws holding the burner assembly down are clean and tight. Unfortunately, the flame current with the old controller fluctuates a lot; sometimes it is 4 (microamps?) but sometimes it goes down below 1.0. It never goes a whole season without a F10 failure. That is why I wanted to upgrade the control board.