Question about Rinnai Digital Remote Water Heater Control Mcc-45-4us

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How do you check the temp coming out of the unit on this controller

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You need a thermometer. like this one...

http://www.amazon.com/Taylor-Digital-Instant-Read-Pocket-Thermometer/dp/B00004XSC3

hold it under the hot water. this is what I use, they work great and pretty accurate.

Posted on Sep 08, 2010

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Posted on Jan 02, 2017

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My boiler dosent come on i have no hot water but when i turn the heating on boiler works but still no hot water what should i do


Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.

Apr 03, 2015 | Water Water Heaters

1 Answer

Error code tankless gas


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch AquaStar 2400ES-NG

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Error code e2


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch Water Heaters

1 Answer

Bosch GWH2400 ENG has an E2 message


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Dec 15, 2013 | Bosch AquaStar 2400ES-NG

1 Answer

Bosch gwh 425 hno-l


CHECK LIST

- is the BTU'S enough for the space
- is there proper flow through boiler
- should have 20'F-30'F difference between inlet and outlet temp
- is there air in the system
- is there a lock on via controls that is set to lock out under 20'F
- no matter what if boiler is working properly it should be able to maintain 20-30'F temp difference from inlet to outlet
ex. 60'F in, 85'F out = 25'F split boiler is working right, if temps do not rise means house insulation my be so bad BTUS calculated for the coldest conditions was to low

May 20, 2017 | Water Heaters

1 Answer

I have a instantaneous water system 10H Hydropower ...did not get a manual when installed....I need to have hotter water as it's winter and the water is like warm...not sure what to adjust...opened...


take the cover off the 10 h unit light up the burner by turning on the tap turn the water flow tap on the front of unit (white knob) clock wise slowly feel hot water pipe coming out off unit when temp increases put cover back on check temp at sink if too hot turn knob anti clock wise

May 23, 2011 | Bosch Water Heaters

1 Answer

Pilot light goes out


if the unit goes thru the cycle of heating the water and when temp is met pilot goes out you need to replace the entire temp control if pilot goes out as soon as you release the pilot button you need to replace the thermo couple little copper wire the goes from regulator to inside burner...check for 800 number on front of w/h for warranty info..as regulator can be expensive

Dec 09, 2010 | Reliance Natural Gas Water Heater Control

1 Answer

Heats up the rapidly decreases within in minutes.


Problem new or old? How long you have unit? Sounds like not enough flow to keep burner on. Tankless need at least .6 gpm to keep hot water flowing or else the burner fires then shuts fires then shuts and you get a sandwich effect...hot cold hot cold. If you have new diverter valve in shower -vs- old two handle type try turning hot water ALL the way ON and see if hot stays hot. If it does stay hot then slowly adjust to cool and see if you maintain a good MIX for proper temp. If it goes cold again try this......LOWER control pad setting to a comfortable 105 degrees (ladies) 100 degrees(men) and turn shower valve all the way to HOT. See if your temp remains consistant now and if it does then problem solved. Tankless mindset...set temp on control pad and stop trying to MIX at shower valve. Thats how these things work. Thats why I install a control pad in each bath and one in the kitchen for adjusting ash temp during dishwasher on time. ditto for wash machine. You should never need to turn on cold water if your unit is set to proper temp at controller. Hope this helps

May 17, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Gas heater shuts off after about 3minutes and have clean filter rinnai rce-329h gas heater


I have a problem with what you are asking,, the numbers you have are for a fan convection ROOM heater,, does the fan come on within this 3 minutes of running, if not it could be over heating and shutting down on a safety, if it does the thermostat could be bad and it is reaching the desired temp and shutting off like it shoud,, check the thermostat to make sure it is working properly,, set it at it's lowest temp turn on the unit have a themometer infront of the air flow see if the temp is the same as the setting,, how old is this unit, it may just be time to change with new,, if the controls are bad this unit sells for about 600 and to replace these parts is about 400, go to there web site,, write back and let me know how it goes,, good luck

Jun 22, 2009 | Water Heaters

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