What does this mean c7 13 - Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

I have a model yf-008 110 v 3000w tankless water heater it shows e4 what dose that mean

What do you mean when you say that 'hot water runs but heating won't' ? Do you mean that water is coming out of the hot water faucet, but that it is cold? When you say pump continuously overrunning, what pump and what do you mean by overrunning? I would like to help you, but I'm not sure what you are asking. Also, is this a water heater, or a boiler?

Do you mean size?... height, width, and diameter of a specific model?
Or do you mean the length of warranty coverage. You will need serial number located on label on side of tank.
Or do you mean age of water heater?

Suggest contacting Rheem.com

http://waterheatertimer.org/Water-heater-warranty-by-brand.html
http://waterheatertimer.org/pdf/Find-Age-of-water-heater.pdf

Gene


If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

There is water leakage internally. Possible tank or water inlet or water entering from the combo air inlet/exhaust pipe.

Error code means that you have electronic gas control valve.

Copy following link to identify gas control valve, read error code meanings for each, and download service manual relevant to each gas control, but not specifically Rheem since rheem does not post service manuals.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

The fact that water heater restarts, means that water heater is getting gas, getting sufficient air for combustion, thermister is ok, gas pressure is good, etc.
The fact that you unplug and replug water heater and it works, shows that you have power vent model.
Since water heater worked correctly before, 2 flashes with Rheem power vent model could mean that pressure switch has failed.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Rusted water usually means anode rod depleted and tank is rusting. Change 570241 anode rod every year or so.
Boiling water could mean bad thermostat causing run-away heating so water is released out of TP valve. Replace 994062 thermostat for 4 gallon.
Leaking water at TP valve could mean bad TP valve: replace TP valve with generic valve from hardware store.
Open link for diagram, parts and replacement information
http://waterheatertimer.org/pdf/Bosch-GL_English.pdf

ECO means energy cut off

Attached to the water heater is a troubleshooting chart for your sequence light. 1 flash means..., 2 flashes means...., and so forth. Find the chart, count the flashes and see what it means and we'll go from there. Douglas

code 11 means there is not enough gas

is this a new install?
do you have at least 3/4" gas line to the unit?

It sounds like you are actually in lock out. Recycle is when during a call for heat, the flame goes out, the unit will try to restart itself. Hope this helps