Question about Hobart C44a Commercial Dishwasher
Temp only 123 on wash water
Asuming the gas isn't turned off.
The usual cause is a dirty or blocked air inlet to the combustion box.
Fun to get at as it's behind the conveyor drive motor. When you remove the intake baffle from between the fan and it's rectangular inlet, make a note of how many holes are covered and open. You might have 8 open and 4 half open for instance. Thoroughly clean the inlet, and fan blades and housing.
It's probably choked enough to run a rich mixture, which is reluctant to light. You may even have a backfire when the unburnt gas ignites in the exhaust plenum.
Any further in and you should be a certified gas technician.
There is an interlock switch on the burner box. If you need to go inside the box, shut off the gas. It will allow you to monitor the ignitor and hear and see the ignition arc. Process of elimination from there. Prove for good air, correct manifold pressure, ignition and flame monitor.
Remote chance its the flame rod oxidised. Have new gaskets handy if you are removing the ignitor rods, and place back exactly where they were for correct gaps of igniter and flame rods.
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
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Sep 26, 2011 | Heating & Cooling
Thank you for posting your question here on Fixya.com.
There are only two things that can cause a heater to run yet doesn't adequately heat the water. One is a clogged up and sooted over heat exchanger. It seems odd you do not mention periodic cycling of the heater too as usually you get heat roll-out from the bottom of the heater when this condition is present and that will trip a heat sensor from time to time.
Opening the top of the heater to expose the heat exchanger tubing will confirm this. If it is all tarred over it needs to be removed and steam cleaned and/or power washed to remove all the soot; once cleaned the heat can then be transferred thru the exchanger into the water.
The other possibility is poor gas flow either due to poor gas pressure or clogged up orifices, manifold or burner tubes. With the heater running inspect the flames from below. If they are bright blue and 2 - 4 inches tall on all the burners you heater is running fine. If not, you need to resolve the gas flow issue.
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