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Gas spa heater ignition lockout when raining

Hi! I’ve got a Pentair MiniMax 100 natural gas spa heater. It’s new to me, but approximately 12 years old. After a lot of cleaning, I’ve got it wired up and functional, but I’m running into a very strange issue. In normal weather it works ok, but when it’s raining out (that’s my theory anyway), the heater won’t stay lit. The electric ignitor sparks, the gas ignites, but then the ignitor isn’t sensing that the flame actually lit. At that point (I think it’s 4 seconds total), the heater shuts of the gas supply and the flame goes out. However, this problem seems to only occur when it’s wet or raining out. Any ideas? A lose wire somewhere? A bad ground?

Here’s the manual that includes a wiring diagram. This is the direct spark ignition model:

Pentair MiniMax Manual for Model 100 Pool Heaters

Here’s a video of what happens:

Update:

I tested the current at on the flame sensor, and it’s peaking at .3 microamps. So I’m pretty sure the flame sensor is the issue I need to track down here. I’m thinking it could be a ground-related issue since this seems to work ok in dry weather but not in wet weather.

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Three blinking lights is an Ignition Lockout:

  1. Should the main burner fail to light, or flame is not detected during the trial-for-ignition (TFI) period the control will go into lockout and the valve will be turned off immediately.
  2. Recovery from lockout requires a manual reset by resetting the thermostat or turning off the ON/OFF switch for a minimum period of 5 seconds.

So it’s very possible the flame detection sensor isn’t working. You can test that:

Flame current is the current which passes through the flame sensor to ground. The minimum flame current necessary to keep system from lockout is 0.7 microamperes. To measure flame current, connect DC microammeter to the FC- FC+ terminals as shown in Figure 5. The meter should read 0.7 microamperes or higher when the heater is firing.

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Seems like it’s one of the first three here:

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Luke Soules wird auf ewig dankbar sein.
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