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My Rheem professional water heater light is flashing blue

Customer Question
slow 3 times and then...
My Rheem professional water heater light is flashing blue slow 3 times and then pauses. Do you know what that means?
JA: How long has this been going on? And how severe is the problem?
Customer: No hot water, just started.
JA: Do you plan on doing the work yourself?
Customer: If it's simple to fix.
JA: Anything else we should know to help you best?
Customer: no.
Submitted: 1 year ago.Category: Plumbing
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Answered in 2 minutes by:
7/24/2016
Plumber: Rick, Construction Supervisor replied 1 year ago
Rick
Rick, Construction Supervisor
Category: Plumbing
Satisfied Customers: 22,386
Experience: Licensed Master plumber with 40+ yrs. experience.
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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

3 flashes is a draft pressure switch open error. This switch must close proving there is adequate draft before the burner will fire up. One possible cause is a blocked exhaust vent.

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Customer reply replied 1 year ago
How do I fix this problem?
Plumber: Rick, Construction Supervisor replied 1 year ago

You need to check the exhaust vent for blockages. Another possibility is that the small diameter vacuum tubing connected to the switch (on top of the heater) is kinked, disconnected or has water in it (should be dry). Beyond that assuming the exhaust fan is working, replacing the switch is the next step.

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Customer reply replied 1 year ago
No blockages on what I beleive is the exhaust vent on top of the water heater. I'm assuming it's the black vent on top of the heater. Is that correct, where is the switch. all I see on top is a giant black large vent attachement and the hot and cold water pipes.
Plumber: Rick, Construction Supervisor replied 1 year ago

You seem to be describing the exhaust fan assembly. The vent is the pipe connected to it. You need to start where that pipe terminates outdoors. I gave you a pictures of a typical pressure switch and it has a small diameter tubing connected to it. It's on top of the heater attached to the fan assembly.

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Customer reply replied 1 year ago
Do you have a clearer picture of the switch and where would it be located. I see the fan assembly and the tube that is pressed up against it and leads outside the house. I can't find the switch. Is it embedded inside the fan assembly below the piping attached to it leading outside. If I find it is it easy to replace?
Customer reply replied 1 year ago
If so, can you provide the steps to replace it and where to find one?
Customer reply replied 1 year ago
Should the part be under warranty?
Plumber: Rick, Construction Supervisor replied 1 year ago

The only place you can buy a switch is a plumbing supply house hat sells Rheem and they usually won't sell to an unlicensed person. Your best chance is to check out the other possibilities I mentioned before. I need the model number of your unit

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Customer reply replied 1 year ago
PROG50-42N RH67 PV
Customer reply replied 1 year ago
The tubing is PVC pipe so no kinking and it's nor blocked and is dry.
Customer reply replied 1 year ago
Must be the switch
Customer reply replied 1 year ago
Could it be that the PVC piping got wet from a big storm and damaged the switch. Obviously now everything is dry. However, this would leave the switch damaged.
Plumber: Rick, Construction Supervisor replied 1 year ago

Have you checked where the vent terminates outdoors? No the switch tubing is not PVC the vent is PVC.

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Customer reply replied 1 year ago
it looks fine and unblocked.
Customer reply replied 1 year ago
the switch is connected to the other small diameter tubing on the end?
Customer reply replied 1 year ago
the PVC vent pipe is not blocked.
Customer reply replied 1 year ago
With that said it's probably the switch as I suspected.
Plumber: Rick, Construction Supervisor replied 1 year ago

Looks like there is an access panel you have to remove to get to the switch on this model. If the tubing to the switch isn't kinked or full of water then it could be the switch. If the unit is less than 6 years old it may be under warranty.

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