hayward heater hd135id error code bd

[rknerem]

I have a hayward hd135id heater. I had to replace the heat exchanger after only 2 years. After this I get a bd error code. When I reassembled the heater and plugged it in the fan came on immmediately and ran for about 10 seconds and shut off, but there was no display. Iopened it again and checked the display ribbon cable and it is slightly loose at the board. I pressed it in again and then restarted the heater, the display came on and shwed 64 degrees for roughly 5 seconds and tripped the bd error code. The fan never turned on before the code was kicked out. checking the ribbon cable again caused it to kick out a CE code and the fan came on the same way as earlier. pushing in the cable again cleared the CE code but no fan and kicked put the bd code. So, when the display iworking correctly, no fan and bd code. When the display is off or CE code the fan comes on at stsrtup. Could a bad ribbon cable cause a bd code? Is the fan supposed to come on when plugged in?
any help would be greatly appreciated.
Thanks Rich.

 

[ajw22]

Welcome to TFP.

Have you looked at the Error Codes on page 39 of https://www.hayward-pool.com/assets...Series_135K_ABG_Gas_Heater_Manual_ENGLISH.pdf





The blower should be the first thing to come on before the ignition cycle.

 

[rknerem]

yes, I read all of the manual, not many answers, bd code is very vague.

 

[ajw22]

Did you measure voltage at the E10 connector?

 

[rknerem]

yes, 112 v at E10. Transformer output is good. Resistance across ignitor is good. hecked continuity on all pins of the ribbon cable to the display. The fan works (when the display is disconnected). Tested the vacuum switch for the fan and it works. I found out the bd code is kicking because the fan is not coming on at startup. I did this by disconnecting the vacuum switch and putting a jumper wire between. This took away the code, but, nothing happens because the fan is not working. So, the fan works when the display is disconnected, doesn't work when the display is connected. The manual says that the gas valve can cause this code (being open when its not supposed to be, or closed when its not supposed to be). Is there a way to test the operation of the gas valve? I know it can be a bad board, but its a pretty costly part to just buy and hope it works.

 

[ajw22]

Post pics of your heater and the gas valve. If the gas valve has corrosion it needs to be replaced.

@1poolman1 @swamprat69 may have ideas.

 

[1poolman1]

yes, 112 v at E10. Transformer output is good. Resistance across ignitor is good. hecked continuity on all pins of the ribbon cable to the display. The fan works (when the display is disconnected). Tested the vacuum switch for the fan and it works. I found out the bd code is kicking because the fan is not coming on at startup. I did this by disconnecting the vacuum switch and putting a jumper wire between. This took away the code, but, nothing happens because the fan is not working. So, the fan works when the display is disconnected, doesn't work when the display is connected. The manual says that the gas valve can cause this code (being open when its not supposed to be, or closed when its not supposed to be). Is there a way to test the operation of the gas valve? I know it can be a bad board, but its a pretty costly part to just buy and hope it works.

At some point in the try for ignition there should be 24vac at the terminals of the gas valve. If you get that reading and don't hear the "click" of the valve opening the valve indicates as bad. If you never see voltage at the valve the issue is somewhere in the control.
If you do hear the valve open, check to be sure any manual valve in front of the heater is open. You'd be surprised how many times someone shuts that valve and forgets.

 

[rknerem]

Unplugged the leads to the gas valve with display connected, attached multimeter, unplugged heater, plugged in heater, no fan, no voltage to gas valve. Repeated with display disconnected, fan comes on, no voltage to gas valve. Gas valve in basement is open. output at transformer 25.7v.

 

[rknerem]

more checks done today, 25.7 volts at transformer, 25.7 at e12 e13, 26 volts at display connection e7, jumpered power to gas valve and it clicks, no voltage to gas valve. Safe to assume bad board?

 

[1poolman1]

more checks done today, 25.7 volts at transformer, 25.7 at e12 e13, 26 volts at display connection e7, jumpered power to gas valve and it clicks, no voltage to gas valve. Safe to assume bad board?

If voltage never gets to the gas valve it is most likely a bad board, yes.