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Cant light my heater rannai reh 18 p

Pilot lights but burner want light

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I would suspect the gas valve is defective.

Posted on Dec 08, 2016

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Posted on Jan 02, 2017

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Pilot lite will not stay on when I release the igniter pressure knob REH-18-N wall heater!


IS there gas? YES ok. So if you can get the pilot lit, but when you let up on the button it goes out. Few things to check. On some heaters the manf. install a safety switch to drop the pilot out if its not venting or if its over heating.

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Would high winds and rain cause pilot light on a rannai tankless water heater to go out?


Yes.
High winds can cause reversal of air flow down vent pipe causing pilot flame to blow out.
If situation happens frequently, then special roof cap has to be added.
Have plumber check natural draft up vent pipe.
Other things can cause same problem, for example if vent fan is located in same room as water heater, or house is tightly insulated, and vent fan is ON, then it will draw air down the water heater vent and blow out pilot.
http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf

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1 Answer

Heater sparks but won't light model#reh-18-n


Bob, there are several reasons for what you described:

The gas line shutoff valve is turned OFF. The unit is not getting gas for ignition.
The pilot is clogged and needs to be cleaned.
The Child Lock Out button has been activated.

The above are the top 3 things that usually cause what you have described. Troubleshoot those and you will more than likely solve the problem.

Good luck. I hope this helped steer you in the right direction.

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I have an older RinnainTropic, Model REH-27D-p, heater. When I try to light the pilot it will light but it doesn't matter how long I hold down the control to warm up the pilot goes out.


Need to buy a thermocoupling. Any hardware store should carry it. When tightening into gas valve tighten fingertight then 1/4 turn with a wrench. No tighter!

Mar 27, 2010 | Heating & Cooling

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Greenhouse Heater pilot light will not stay lit


replace the thermocouple. it is a small copper tube that screws into the gas valve and goes to the pilot assembly. a good haedware store that sells heaters will have one. they come in various lengths 18"-48".

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The pilot doesn't stay on. the flame doesn't extend out as far as it normally does. The model number is Reh-30dt-p.


The pilot light will extinguish when you turn the valve to on for main burner... cause is a bad thermocouppler. it's yhe bulb the poilot light heats up.

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Pilot goes out after heating cycle


Check regulator on the unit.
Check pilot unit on the heater
use soapy water to check for leaks if see bubbles turn off main gas supply valve.
always turn off gas supply before any checks or repairs are made
when all else failes call your local gas provider to check heater and gas supply

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Pilot light keeps going out


Dan, Since you just had the tank filled and the heatewr installed a tinty piece of trash could have entered the pilot orfice. Un do the lower floor panel take off the pilot assy. Blow out the small pilot orfice. Blow reverse from normal gas flow to unlodge the debre. Re asemble and light.
If this dosen't work It may be the pilot air intake is too open causing the pilot to blow itself out.If thats the case close off the air adjustment some. It will be located behind where the flame exits the pilot orfice.

ljtomega

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