In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Rinnai works intermittently
I have a 10 year old Rinnai external tankless water heater. For the past month it has intermittently stopped putting out hot water and initially gave me a code 12. I contacted my gas supplier and naturally, when he arrived the next day it was working fine. While here he also checked gas pressure and a few other things. Everything seemed up to spec. About a week later it again stopped working and gave a code 11. Both these codes indicate some type of ignition problem. I pulled out the flame rod and electrode and cleaned them as they did have a light coating of loose corrosion. Put everything back together and it worked fine for a couple more days. Today I get another code 12 and no hot water. What's weird is the problem seems to happen in the morning. Later in the day it begins working again. Although this isn't always the case.
In April the unit was getting no power at all so I had a tech from my gas supplier come out. After getting on the line with Rinnai tech support it was determined the problem was a bad transformer or PC board. After replacing the transformer with no results, I replaced the PC board which solved the problem.
Anyone got any ideas? I've got a new flame rod and electrode on order from Rinnai just in case that's the culprit. I just don't know how much more money I want to sink into a 10 year old unit. If I do replace it I will get a similar unit.