Max-E Therm SR400LP - Control Board LED doesn't come on

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@1000RR STOP!

You do not have an IntelliCenter. You have an EasyTouch 4 system.

The EasyTouch has socketed relay drivers and your board may be repairable with a $5 chip.

While all your posting have said IntelliCenter I not see your signature says EasyTouch.
 
Here is a thread on a member with the same heater control issue on an IntelliTouch board, which is basically the same as the EasyTouch, and his board was fixed with an 8 pack of chips from Amazon.

Intellitouch not controlling the Mastertemp

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...
www.troublefreepool.com www.troublefreepool.com
 
ajw22 said:
I think something is missing from the diagnostic flow chart. The Fenwal operation is described in....


Fenwal says:

Start Up - Heat Mode
When a call for heat is received from the thermostat supply in 24VAC to TH/W, the control will reset, perform a self-check routine, flash the diagnostic LED and begin a pre-purge delay.
Following the pre-purge period, the gas valve is energized and sparking commences for the Trial For Ignition (TFI) period.

24VAV in TH/W is what tells the Fenwal to start the ignition process and start the blower on heaters that use the blower.
Click to expand...

ajw22 said:
I think something is missing from the diagnostic flow chart. The Fenwal operation is described in....


Fenwal says:

Start Up - Heat Mode
When a call for heat is received from the thermostat supply in 24VAC to TH/W, the control will reset, perform a self-check routine, flash the diagnostic LED and begin a pre-purge delay.
Following the pre-purge period, the gas valve is energized and sparking commences for the Trial For Ignition (TFI) period.

24VAV in TH/W is what tells the Fenwal to start the ignition process and start the blower on heaters that use the blower.
Click to expand...
The Fenwal ignition control that you are showing is for a direct spark ignition system that both lights and proves flame directly from the spark ignitor to the burner. Note that the Fenwal has no IND terminal nor any F1-F2 contacts. Different sequence of operation.
 
swamprat69 said:
The Fenwal ignition control that you are showing is for a direct spark ignition system that both lights and proves flame directly from the spark ignitor to the burner. Note that the Fenwal has no IND terminal nor any F1-F2 contacts. Different sequence of operation.
Click to expand...
Thanks. I will keep on looking for the correct data sheet for the Fenwal used in the Pentair MasterTemp.
 
Here's some pics of the front side of the EasyTouch4 control board. Nothing looks burnt from the outside...
 

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ajw22 said:
Thanks. I will keep on looking for the correct data sheet for the Fenwal used in the Pentair MasterTemp.
Click to expand...

I believe this is the data sheet for the Fenwal used in the MasterTemp.


The W terminal the data sheet refers to looks to be IND on the models used by Pentair.

It says:
Power-Up / Standby
Upon applying power 24 VAC to the R terminal, the control will reset, perform a self-check routine, flash the diagnostic LED and enter the thermostat scan state.
Call for Heat
When a call for heat is received from the thermostat supplying 24 VAC to the W terminal, the control will check the pressure switch for normally open contacts. The inducer blower is then energized and, once the pressure switch contacts close, an optional prepurge period begins. After the pre-purge, the Igniter is energized for the heat-up period, and then the gas valve is energized for the Trial for Ignition (TFI) period.
 

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ajw22 said:
Read here about the EasyTouch relay driver chips - Pentair Automation Systems - Further Reading
Click to expand...
Interesting reading and thanks for sharing the other link too. I went on and ordered a 10-pack of the relay drivers. For less than $10 it's hard not to gamble a try on it. Since it's only the heater not firing right now and it's not really needed for quite a number of months from now (Florida), I figured why not. I did order the new Fenwal. I'll update this thread once parts get here and I get them installed. Thanks again!
 
Got the heater running, still waiting on the relay drivers for the EasyTouch main control board to see if it's a simple fix as to why the main PCB is not signaling the heater (closing the relay on the main board at the EasyTouch). The heater did end up being the Fenwal Ignition Control Module. With the help of Allen and Tim on here and following the trouble shooting flow diagram in the manual, it indicated the Fenwal was bad - and it was. Replaced it and heater is working properly now. I took the old Fenwal apart to see if I could see any obvious damage. It appears I may have a couple resistors that may have gotten fried (circled some darkened areas on the board, pics below).
 

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Update on the EasyTouch Control Board and replacing the Relay Drivers. Without replacing them, the relay for the heater would fail to 'close' when heat was called for. Once I replaced the relay drivers, the heater relay stayed closed fulltime (without heat being called for). I tried other relay drivers too (since I had 10 of them) and they all resulted in the same - relay stayed closed fulltime. Something isn't right within the relay circuitry for the heater on the EasyTouch PCB, aside from the relay driver. So I pulled the new relay drivers back off since I don't want heat being called for fulltime. I put the original relay drivers back in... heater relay back to how it was (won't close when heater being called for).

I'm not good with soldering (and don't know anyone or have anything I know of close) so it looks like a new PCB will be on the horizon.
 
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1000RR said:
Update on the EasyTouch Control Board and replacing the Relay Drivers. Without replacing them, the relay for the heater would fail to 'close' when heat was called for. Once I replaced the relay drivers, the heater relay stayed closed fulltime (without heat being called for). I tried other relay drivers too (since I had 10 of them) and they all resulted in the same - relay stayed closed fulltime. Something isn't right within the relay circuitry on the EasyTouch PCB, aside from the relay driver. So I pulled the new relay drivers back off since I don't want heat being called for fulltime. I put the original relay drivers back in... heater relay back to how it was (won't close when heater being called for).

I'm not good with soldering (and don't know anyone or have anything I know of close) so it looks like a new PCB will be on the horizon.
Click to expand...

Let's have @ogdento think about that behavior when he wanders by.
 
ajw22 said:
Let's have @ogdento think about that behavior when he wanders by.
Click to expand...
I will add that when I pulled one of the relay drivers off, the pin connections on the board where it pluged in, one of the pin sockets on the board looked like it had heated up (was tarnished looking). I'm sure that was part of my whole lightning surge debacle.
 
I'm closing out the thread with the final results. I know a lot of threads end up never getting updated with the final fix (pet peeve of mine). So here's the fix(s). BIG thanks to Allen for a LOT of guidance. Swamprat and Tom - thank you guys too.

I ended up having two issues with why my heater wouldn't turn on after the lightning surge from a struck tree in my back yard (which is well on its way to dying). The issues and fixes were:

1) Heater's ignition control module (Fenwal) was cooked and would not send a proper signal out to kick on the blower. Replaced the Fenwal and the heater began working fine.
2) The EasyTouch control panel would NOT send a remote signal to tell the heater to turn on. I tried replacing the Relay Drivers and it did not help. The fix was a new main control board for the EasyTouch. Replaced that and it's sending the heater on/off signal again to my heater. All is working good again.

Side lesson learned (aside from the whole experience): When I had set up my "Screen Logic Connect" on my computer and spent a LOT of time with setting up names for circuits, flow rates for various features/pump calls, schedules, etc., fortunately I had taken screenshots and saved them to a WORD document. When I replaced the main control board most all of that seemed to go away. So it wasn't too bad setting that back up.

Thanks again to all that helped!!!
 
Glad you got it fixed, and thank you the update... One of my pet peeves too!

And apologies for not commenting on your odd driver behavior... I missed that notification. But, since the drivers alone didn't fix it, it's likely that one of the small soldered chips above the relay driver sticker (these control the drivers) got fried.

Smart to snap pictures of your screenlogic config... As you discovered, screen logic doesn't store a backup of your config (only the indoor and handheld remotes do)
 
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Thanks Tom, and no worries... I figured that once the relay drivers didn't fix the issue I was on to a new board. I guess the good news is I have a spare board for the EasyTouch now. It may not run the heater, but it'll run everything else. I also have a spare heater board and touch pad and a handful of relay drivers. Hopefully we don't have another hit like this again.
 
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