Intellitouch not controlling the Mastertemp

[tornado]

Hi

I have an IntelliTouch and a master temp. At some point recently my master temp refuses to 'listen' to the IntelliTouch control. Reading through TFP I see that it is a fireman's switch that controls the mastertemp.
I have set the master temp to 104 like others have suggested, but the master temp refuses to turn off when the set point is reached on the Intellitouch.
I have since pulled the 2 wire connector off the Intellitouch which turns off the Mastertemp. Plugging it back in, the master temp turns on and calls for heat (even when the Intellitouch is not calling for it.)

I'm looking for any advice. Does the address of the MT unit matter? I've tried address 1 and 2 but nothing seemed to change.

Attaching a couple of pictures of the setup.

You can see that the circuit labeled gas heater is NOT on, the master temp is still heating and the controller is not calling for heat either.

Any suggestions are welcome!

Thanks

Joe

 

[ajw22]

The heater does not use addresses when controlled by the Fireman’s Switch.

It sounds like your heater relay on the IntelliTouch board may be welded shut which would keep the heater running.

Do you have a multimeter? Use the ohms or continuity setting to check if the heater relay on the IntelliTouch board is open when no heat is called for.

 

[tornado]

To be clear, the Mastertemp just started doing this within the past month (it was working fine before). I do have a multimeter - I will check continuity on it. Thanks.

 

[wireform]

Do as @ajw22 to check the small relay when there's no call for heat or to say it better no power to the board. If that checks out there is two more things to check. Either the water sensor is bad and not reading the temperature or possibly somehow the programming of what heater is connected to the system changed for instance if has it as a heat pump it won't work the same.

 

[tornado]

I haven't yet been able to make it back out to the system to do the multimeter test but your point about a heat pump changing - yes I got our heat pump back online with this system. How does that potentially affect this @wireform?

Thanks

 

[wireform]

I haven't yet been able to make it back out to the system to do the multimeter test but your point about a heat pump changing - yes I got our heat pump back online with this system. How does that potentially affect this @wireform?

Thanks

You have a NG gas heater and not a heat pump, so what are you saying "got our heat pump back on line"..
Make sure the intellitouch system knows you have a master temp gas heater, also with no light at the heater button there shouldn't be a call for the heater to run so maybe as stated above, the relay is melted closed so it can't unlatch keeping the heater running.

 

[tornado]

To be clear I have both. I have an UltraTemp (being seen as solar) as well as a MasterTemp.

 

[tornado]

Just got back from testing the continuity with the multimeter. It indeed had continuity when no heat was being called for...

> ... It sounds like your heater relay on the IntelliTouch board may be welded shut which would keep the heater running.
> ...as stated above, the relay is melted closed so it can't unlatch keeping the heater running.
Per your comments above about the relay being melted closed - what is my best next step?

Thanks
Joe

 

[wireform]

There may be unused relays of the same kind on the board which I've used instead of the bad relay. It'll need to be unsoldered and resoldered in place. Hopefully your testing done with the wires removed.

 

[ajw22]

@ogdento knows his way around the IntelliTouch board.

 

[tornado]

There may be unused relays of the same kind on the board which I've used instead of the bad relay. It'll need to be unsoldered and resoldered in place. Hopefully your testing done with the wires removed.

Just clarifying - you're saying I need to replace a relay on the System I9+3 board? With one that is on the board but not in use? I can solder and such - can you point me to what the relay is that I should be looking for on the board (do you have a picture or URL I can reference)?

Thanks
Joe

 

[ogdento]

the i9+3 board has the relays and K5 is the one for the fireman's switch... but before you do any soldering to that board, check the relay drivers on the main board. They are the three socketed unl2803 chips labeled U11, U12, U13 and they fail frequently (hence the sockets). U13 is the one that controls the 2-pin plugs on the i9+3 board for the electric heater and solar relay connections, and I think it also controls the fireman switch relay (but haven't checked).

in the event that you do have to replace a relay, do yourself a favor and just buy a new from Mouser or Digikey etc. rather than removing and resoldering an unused one - they're only a dollar or two but might save you a headache.

see my blog post here for more driver information:

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[tornado]

That's great stuff on your blog! Thanks for writing it up. I just ordered the relays - should be here tomorrow. Will let you know how it goes! Thank you !

 

[tornado]

The relay worked just as you said. Thank you!

 

[ogdento]

Great news, and thanks for letting us know you got it working!

Did you get and solder in a new relay, or just a new driver chip?

 

[tornado]

I bought an 8 pack of the chips from Amazon for $8 and used one of those in U13.

Thanks