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Will air in tankless water heater for in floor heating system cause the exhaust fan to speed up and give me an insufficient cold air /exhaust error?

I have inspected the vent tubing several times and am certain it is all correct. The heating system is an open loop. The fan speed is constantly up and down. It will give me a code(10) when the fan continually revs fast. Error code 10 is insufficent cold air/ exhaust. I believe there may be some air is the system as we had run out of water over the summer.( we are in the country and on a well. My installer did not install a purge valve so I have been trying to purge with a garden hose at the hot water outlet of the heater as I hear air running through the heater. My main question is if air gets into the heater,would it cause the heater to try to heat the air and cause the fan to speed up?

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It sounds to me like it is the flue gas exhaust and combustion air, NOT a water issue. If the error reads " insufficient cold air/exhaust" then it is the gas and air mix for the combustion process, not the water lines. Others have already suggested checking the flue and air inlet ("chimney"). Please do this, and ignore those who are giving you advice about the water loop.

Posted on Apr 25, 2017

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I know that depending on what part of the country you live in, some areas can have there utility equipment out side the home not sure of your at but the exhaust must have a certain distance from the unit. If you exhaust threw a wall you should be fine. That being said I would check the inlet to make sure that you have good water flow there should be a small filter at the inlet for the cold water. You check and clean this anyway because you water was off. Then bleed the air out of the system. There are other things to check, but start there.

Posted on Apr 19, 2017

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Posted on Jan 02, 2017

gary1121
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SOURCE: omega tankless water heater giving error code E2 incomplete burn

it sounds like your flu pipe may be clogged,, they just snap together or have little screws holding them together,, take the sections apart and make sure nothing is is the line reinstall and try it out

Posted on Jul 13, 2009

CRTN
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SOURCE: No water flow from hot water tap with a rinnai tankless water hea

Its A Possibility The Left Over Water In The Hot Is Frozen. If Your Line Is Exposed Outside Somewhere It Can Easily Freeze Up. Turn On The Hot Water Everywhere In The House And If Accessible Check The Lines To See Where The Warmth Ends. You Can Leave One Off Over Night In Hopes That It Will Eventually Defrost.

Posted on Jan 16, 2009

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SOURCE: Bosch Pro tankless water heater overheating

The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.

Posted on Mar 16, 2009

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SOURCE: takes too long for hot water.

You need a recirculating line. You will have to hire a plumber to run a water line from the farthest fixture or to the fixture you are concerned about on the hot side and return it back to the water heater. this will cause hot water to constantly run throught the hot water line (via the recirculating line) and when you want to draw water from the fixture, you will already have hot water right at the line.
I know this works with standard tank water heaters, but it is a lil trickier with rinnai units(but very possible) if your plumber pleads the 5th and tries to sell you another unit call the Rinnai manufacturerand ask them how.

Posted on Jun 20, 2009

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SOURCE: tankless water heater error code 11

I was having the same problem untill I reallized it was my venting system. Test the water heater with no vent on top. Disconnect the vent pipe from the water heater and try turning on the hot water. the water heater needs a special adapter to vent the direct vent water heater. One other thing you can check is the gas pressure in your home. You have to have between 7 and 8 WC (water Column) for the tankless water heaters. You can call your gas supplier to find out what you have.

Posted on Jul 04, 2009

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1 Answer

Recently installed a Noritz NRCP 112 water heater, but very frequently it keeps shutting off and on the display it says error 60, after looking at the manual there is no explanation of what error 60 is....


Shut downs with new heater might be defective PC board.
Other issues could be associated with improper installation.
Low gas pressure caused by undersized gas meter or water in the gas line, undersized gas line to unit (requires 1" gas line to within 10 feet and then 3/4"), wrong type of gas line (cannot use flexible gas line), improper vent (for example too long horizontal run or undersized vent pipe or shared vent with furnace or other gas appliance), not enough incoming fresh air supply, nearby exhaust fans or vent fans stopping proper draft on tankless, temperature set too high for cold incoming water supply (install tempering tank to help preheat water),..
http://waterheatertimer.org/Tempering-tank.html

Other causes can be clogged water filter located where cold water enters tankless, or clogged water line, or crossover caused by bad single-handled faucet or bad crossover valve on recirculation system, improperly sized recirculation system. These problems can mean less water flow through tankless, so burner shuts down, and unit throws error code because sensor indicates water flow is still moving but inadequate to trigger burner
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Water-heater-recirculation-system.html


Gene
Water Heater Timers Save Money

Nov 27, 2014 | Water Heaters

1 Answer

Eco 180dvp What is an error code 5? Thanks


Imperfect Combustion
Clean air inlet filter.
Clean combustion air fan.
Clean heat exchanger fins.
Check for adequate combustion air ventilation openings and clean if necessary.
Check vent system for partial blockage and correct as necessary.

Nov 02, 2013 | Rheem Paloma Tankless Water Heaters...

1 Answer

Error c4-15 what does that mean


Before calling service technician, copy following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

Aug 26, 2012 | Rheem Tankless Hot Water Heater...

1 Answer

Have an Ecosense Tankless Water Heater with error code C7. It then flashes to 76 degrees and gives cold water. How do we remedy?


Before calling service technician, open following links for troubleshooting resources and typical manuals.
http://waterheatertimer.org/pdf/Rheem-error-code-C7-76.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Tankless water heaters require yearly maintenance.
Many causes for common error codes are covered in the yearly maintenance.

Jul 18, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

2 Answers

I keep getting a C2 11 error code. Unit lights and immediatly goes out showing that error. At other times it operates fine. The problem seems to be occurring more frequently. It has been in service...


that error code means not enough gas.
however, there might be something going on with your venting. it could be sucking exhaust air back into the unit. this will cause the same error code.
if your problem is intermittent, then I would suspect the venting to be the issue.

Aug 22, 2010 | Rheem Paloma Tankless Water Heaters...

1 Answer

Mouse got into the hot water heater thru the exhaust, now we are told that the fan bearings are bad - we have hot water, but when at the shower, it cannot produce enough hot water to keep up with the...


theoretically possible-----a mouse can get in, but most exhaust fan bearings are permanently sealed and are expected to run perfect for their designed life, without any need for lubrication---if a mouse got in, i can only assume that it was chewed up (or it's **** /urine) and was pulled into the motor/bearing shaft and caused some slow in revolutions due to animal parts grinding in the smooth bearings ---it could happen--it depends on how the bearings are sealed around the exhaust motor shaft....orrr, the mouse was killed by the spinning exhaust fan blade, and then "pasted" to the fan blades(ironically called a squirrel cage) and this caused extra weight and an unbalanced exhaust fan which would rapidly cause wear and burnout of bearings due to tremendous speed of exhaust fan---i have seen many a dead rodent inside "squirrel cages" (furnace and water heater exhaust fans and their housings)...in fact i chose to even scrape some of them out for refurbishment!

Mar 01, 2010 | Rinnai Webstone The isolator EXP tankless...

1 Answer

We have a robbens underfloor heating system with a heatrae electric boiler on a floating floor system. The underflooe heating manifold has a grundfos Alpha + pump. What setting should this be at? Currently...


Venting of the system is when you re circulate the water or cooling fluid in higher speed to eliminate the air bubbles from the system.
If water circulate on a too higher rate does not have time to dissipate the heat so your floor is cold.
You need to go to 2 or even 1 depending on the length of the heating coil in the floor. Unfortunately the pump only has 2 speeds (setting 1 and setting 2) so whoever install your system had to calculate the length of the pipe for maximum efficiency. Try on 2 and if not satisfactory go to setting 1. If too hot on setting 1 then you can adjust the heat by reducing the amount of water from the shut-off volume control. It is a hit and miss situation, I know but unfortunately that is the only choice remaining now after the system is installed.

Jan 10, 2010 | Grundfos RCP-96 Recirculation Pump for...

1 Answer

Flashing code 90 .


The 90 error code is caused by two conditions:

1) the unit is under heating the water (not hitting the set temperature)
2) the fan is encountering resistance to air flow, which causes it to over correct

The most common causes for this conditions are:
1) insufficient BTU supplied to the unit
2) clogged fan motor or vent
3) insufficient makeup air
4) improperly installed exhaust vent

Nov 10, 2009 | Noritz Tankless Water Heaters N-0931M

1 Answer

The number 12 shows and there is no hot water


The error 12 means flame loss. It is most commonly caused by insufficient gas pressure supplied to the unit, but it can also be caused by debris on the flame rod. Blockage in the exhaust vent or a stuck flue damper can also cause a 12 error code

Nov 09, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

2 Answers

What is error code 59 on a noritz tankless water heater lp?


The 59 code is typically caused by insufficient gas supply to the unit. It can also be caused by obstructed exhaust flow, stuck exhaust damper (located directly on top of the unit's exhaust), insufficient makeup air, or improperly installed venting (i.e. too long or too many elbows).

I would recommend initially checking the incoming gas pressure at the gas connection on the unit. The gas pressure should not drop below 5" water column for a natural gas unit, 8" for a propane system (the unit need to be operating at its maximum output).

Apr 29, 2009 | Noritz 7.1 Gpm Propane Lp Gas Tankless Hot...

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