20 Most Recent Noritz 7.1 Gpm Propane Lp Gas Tankless Hot Water Heater - Page 5 Questions & Answers

You have gas water heater.
Probably a tank-type gas water heater.

The plumber can fix water heater.
If you want to fix water heater yourself, then more information is needed to narrow down scope of answer.
1) Add a comment for possible help.
Instructions for lighting the water heater appear on front of water heater. Do those instructions include lighting the pilot light?
Will the pilot light stay lit?
On side of tank is a label. Label shows Brand, type (LP or NG), and model number.
This information can help narrow the type of gas control valve, and point direction for troubleshoot.
Add a comment with this information for possible help.

2) Do-it-yourself: Open following link for do-it-yourself resources to help solve gas water heater problems:
Generally the instructions show how to clean water heater parts, check venting, and show different types of gas controls, plus links for pilot light problems and cleaning air intake.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Problems may be unrelated.
Open following link for electric water heater troubleshoot checklist and resources.
http://waterheatertimer.org/Test-electricity-to-water-heater.html

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

If the water is coming down over the fan motor, you probably have a heat exchanger leak. If the heat exchanger is leaking, it needs to be replaced. The heat exchanger is the large copper box on top of the heater.

Hi,
Is the vent going straight up???

If so maybe you can get a better cap or a 90 on there to keep the rain from coming in...

But it may also be a humidity problem and the higher humidity change the air fule mixture just enough to keep it from working...

heatman101

cut the power, power it up again, and restart it.

my ex-wife told me,, cold baths are good for you???? i dont believe a word of it???
could the termostat have packed up on you?

check your gas pipe size. make sure you have enough gas running to the unit. also turn all your faucets on hot and turn off the cold water to the heater and see if you get any water out of the hots anywhere, that could mean that you have a cross connection.

You're most likely getting a pressure wave (spike) that is generating momentary flow across the flow sensor. The heater is registering this "instant" flow and beginning its firing sequence. Once the flow dissipates, the unit then goes into a purge cycle. I'd recommend having your water pressure tested to make sure it isn't abnormally high (above 60 psi) or abnormally low (below 30 psi). Assuming the pressure is normal, you can use a pressure reducing valve or pressure regulator to absorb the spikes and stop the unit from cycling.

I am not sure they are available to non Hitachi service centres. https://documentation.hitachiaircon.com/glb/en/pac/rua-at3s

Cannot find the fault code . There are vidoes on u tube saying how to reset thr code By pressing the reset button . If this does not work youcan ccontact vaillent on there web page . I have a mate who works for them i will ask him as well

Do I need to insulate this heater out in the shed? Freezing temperatures

Call a engineer

The P8 fault can mean many things when it pops up on your Mitsubishi Electric wall controller. The P8 fault is activated when the indoor coil sensor does not change the temperature for a set amount of time after the compressor is (or should be) switched on.

Where does the tube sensor go

This one looks the same.https://www.ebay.ca/itm/133397559348They are made by Harper Wyman and using that model number, this is the result.https://www.google.com/search?q=Atwood+RV+oven+control+valve+57294But this shows more that looks similarhttps://www.google.com/search?q=Harper+Wyman+oven+control+valveAnd then if we go here and Zoom in, you will see MTZ 22300https://youngfartsrvparts.ca/products/used-atwood-wedgewood-oven-thermostat-57294Which leads us here and the Specs Sheet.https://www.copreci.com/en/gas-cooking/product-range/thermostats/with-safety-and-thermostatic-flow-regulation/372-mtz-22300-seriesand from there to here, and Parts Town stocks them!List Price: $ 318.24https://www.partstown.com/fagor-commercial/fgrc12008712..

call plumber to replace gas valve, it may cheaper replace water heater. gas valve is not DIY

test for sticking relay faulty circuit board or faulty stat

Beware when working with electrical equipment. It may cause electric shock. Check the power supply wires, connections with heating coils. If they are ok then possibly heating coils require replacement.