Hello, We have a N-0842-MC-NG that is around five years old. Recently, on our very cold below zero days, it has been taking quite a while to heat up, maybe five minutes. Today it is not heating at all. I don't know if the cold is a coincidence. It has power and flow. The burner light is not on. Do you have any advice? Thank you, Judi
Change your thermocouple; it is the brass colored pencil like metal rod that sits over the burner and has a tube attached to the end of it the tube goes to the main gas valve; unscrew the thermocouple at the gas valve and remove it the main gas valve opens when the thermocouple gets hot by being in the pilot flame
Severe cold can cause a variety of problems with gas appliances.Check the exhaust pipe termination to make sure it is not frosted shut. Also check regulator vent for frost. Hope this helps.
SOURCE: Takes long time to heat then goes from hot to cold.
I know that this is a great answer but with out being there its hard to answer you call there tech support they are great, I have had to call they from jobs before they can help
Phone Support:
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729
SOURCE: Worcester combi boiler losing pressure & water through o/flow
having the same problem and its a new bolier. thanks , adriano.
SOURCE: water is hot until you adjust the shower
These unit is design to operate at a specific flow rate and cannot be ajusted if you need to have a warm shower you will need to get a bath remote where you can turn down the temp whenever you need without disrupting the flow rate
SOURCE: Water is way too hot.
Before calling service technician who has service manual and can test which part has failed, open following links for troubleshooting resources including steps below and phone number for Bosch:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ETechSupport/Troubleshooting/tabid/1131/Default.aspx
Clean inlet filter
Check all faucets for clear pathway
This unit does not work with preheated water (solar assisted)
Incoming water above 70 degrees, avoid restricted faucets
Check that both temperature sensors are making contact and firmly mounted on respective cold and hot pipes.
Descale heat exchanger
http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G2-13_Descaling.pdf
The gas flame igniter is not working properly.
Go to the link below and type in your model or select it and the instructions take you through the gas pressures and so on.
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