It sounds like you may have either too slow of water flow moving through the heater ( caused by a dirty filter ), or you may have a bad high limit sensor. Check to see that the filter is clean first.
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OH is the Over-Heat event code. Not likely related to the board, this comes up for a number of reasons - Flow issues cause the heater tube to get too hot. Dirty filter, suction blockage, low water level etc... Hi Limit sensor has failed or the temperature sensor reading incorrectly. Usually its a flow related problem
OHS, OH, or SPA TEMP LMT Message
There is an "Over Heated Spa" (OHS or OH) Water Condition.
One
of the Water Temp Sensors has detected 110°F (43.3°C) Incoming Water
Temp and Spa Functions are Disabled. System will Auto Reset when Water
Temp is below 108°F (42.2°C). Check for Extended Pump Operation or High
Ambient Temp, or contact your Dealer or Service Organization.
Spa Water Cool Down •
In order for the Spa Water Overheat Error Message to Automatically
Reset and Clear, the Spa Water Must Cool to below 108°F (42.2°C). •
Check the Topside Panel Display to see if the "OHS", "OH", or "SPA TEMP
LMT" Spa Water Overheat Error Message has Cleared. If the Error Message
has Not Cleared, the Spa Water is still too Hot to Continue Testing. • Either Wait for the Spa Water to Cool Below 108°F (42.2°C), or Exit Now and Retest at a Later time.
You can find answers to COMMON SPA MESSAGES at the following website:
The tub experienced an overheat situation. This may be due to leaving the t stat turned all the way up and not monitoring or the hi-limit sensor is defective. The hi-limit sensor will shut down the heating cicuit if temp gets above 105 D optimally.the fact that the heater light is on is a good sign that things are working at this point.Whether or not a suitable temp(100-103 D) will be arrived at is to be seen. If spa heat kicks off before set temp is reached then replace hi-limit sensor.
Oh no. ... ok don't panic.... put in the same amount of water your coffee Caraffe holds. If the coffee maker is one of the kinds I recall, it holds water and heats it while you pour in another pot, it pushes the hot water out to fill your caraffee pot. Then you will have to add one more pot only.
When the water quits heating it is a heating element that is acting up. Sometimes the fuse finally gives up. The trick is locating and removing fuse, and replace heating element. These require a service tech to do because of soldering, and making sure the electrical parts are put back in place properly.
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