My neighbor has a problem with his heater. The fan motor and combustion exhaust fan come on but the ignition probe is not geting hot.
Checked the contol board and have 120 volts coming into the board and 120 volts going out to the fan controls but am only getting 67 volts to the ignition probe.
There are also 2 blinking green lights on the control board but I have no idea what they are indicating.
There are a lot of children living in the house and they are short on cash so I am trying to help them with a little Xmas help.
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That exhaust fan is called the Induced Draft Motor or IDM. It's the first action of the heating sequence of operation. It has a small rubber hose connected to the IDM assembly that also connects to the pressure switch. It's possible that the pressure switch is not closing due to a faulty pressure switch, loose wire connection, stopped up hose or where the hose connects is stopped up. Now if it is closing then there is an issue somewhere else in the furnace. Either scenario is hard to troubleshoot without experience and a volt/ohm meter.
Over time after about 5 to 6 years many Noritz heaters tend to display error code 90 and stop working. The unit has to be shut off and back on for it to work again for a short time. Error code 90 is indication of abnormal combustion and can have a few causes, including blockage in the exhaust vent. However the problems lies mostly with the combustion fan. that is the fan that you hear when the unit is running. It is unable to deliver enough air to normal combustion.
Replace the fan and while doing it clean the air pathway with compressed air. In addition remove the ignition and heat senors (all in one assembly, in the middle of the unit) and sand them very slightly with very fine sandpaper (400 or higher) to remove build up on them.
While the fan is being ordered you can at your own risk operate the unit with the cover slightly open (about 2 in.) at the bottom and the unit will run without code 90. It is highly recommended to hire a trained technician for the above work as gas appliances pose a significant danger to human life and property if not installed or maintained properly. This solution is for informational purposes only. Please be safe. Tankless Water Heater Buying Guide Best Prices on Gas and Electric...
electronic ignition or pilot type? assuming electronic ignition, check the airflow sensor for dirt in the peto tube, or a defective sensor, if you hear the high voltage click but have a failed ignition chec that the pilot is being lit, and that the thermopile/infrared sensor is good. one of those is your problem.
Nov 17, 2012 - Uploaded by grayfurnaceman
This furnace should light its pilot with a spark then the pilot proves its on ... Troubleshoot an ignition problem on a Lennox gasfurnace .... Pilot and no inducer but is the same model as that great video! ... You probably have dirty burners. ... How do you know spark module is not sending 24 volts to mv and pv ...
The Fan code would indicate a problem with the combustion air blower. The is a pressure switch to indicate there is sufficent combustion air, and if not then unit shuts down. Either the fan isn't running, or there is an obsturction in the fan or exhaust piping, preventing enough air flow.
cfh would be call for heat, which would be a normal display when water temp is below setpoint
See the link below for a manual. Once you open the page look on lower right side for documents, then install manual http://www.rheem.com/product.aspx?id=2388EEB7-3DEC-4601-AE76-EC7A07F17630
Hi! Take of both access covers on your furnace. In the bottom compartment (where the indoor blower fan is) there is a condensate trap, It will be black, gray, or white. Disconnect the rubber tubing that is connected to it (these tubes run up to the collector box in the top compartment. Remove the condensate trap and wash it out until it is clean inside. You will have to shake it some to get all the dirt out of it. Reinstall it and you should be good to go. Hope I was of help to you!! Good Luck!!