Goodman GMS90703BXA Heater - Page 5 - Answered Questions & Fixed issues

remove burners and dump out rust and dust then put burners back in and restart gas preassure in burners blocking burner ports with rust and dust

water in pressure switch take rubber hose off and drain see if water in induced draft motor that hose hooks to may need a cap on roof pipe to stop water from getting into furnice c lear all water and dry out

The limit switch is a credit card size shaped switch right behind the burners which has two wires attached to it. This switch will trip if the Furnace is overheating, this can be causes by a weak blower motor, dirty air filter, dirty blower wheel....anything that restricts airflow.

Can you verify if the igniter is receiving 120 volts?

Sounds like your flame sensor is dirty or it could be bad.

Check if 24 volts is being sent from the board to the gas valve, if not the board is nad and will need to be replaced, if there is 24 volts at the gas vlave terminals then the gas valve must be replaced.

Hi go to www,valor.co.uk you and request manuals on line with the coal seting in

must have proper gauges and should be done by trained person only.

gas pres checking should be done by trained person with proper guages

The flame rollouts are located in the burner compartment and attached to the sides or top of the metal housing around the actual burners. They are small and round and have 2 wires hooked to them. They are there for safety to detect if the flame is rolling out of the heat exchanger, caused by other possible issues. However, sometimes they do go bad and have to be replaced. Also, your rollouts are ran in series with the limits and may also be that. The only way to track it down is to have a meter that measures continuity and after the unit stops working, see which device you lost current through. Bypassing these can be harmful and cause major problems so I do not recommend it. One thing you can try is to make sure all filters are clean and the air flow throughout the house is "normal". These can cause the unit to overheat and trip one of the limit switches that I mentioned earlier. I also do not recommend watching if the flame is coming out of the heat exchanger causing a rollout to trip, but if it is, you could have a blocked flue pipe or other issues. I hope this helps or at least points you in the right direction. Good luck and happy holidays!

Black- high speed Red- low speed Blue- med. high Yellow- med. low White- neutral Usually black on "cool" terminal on board, red on "heat" terminal on board, and remaining 2 on the "park" terminals on board. White goes to the neutral terminals. Hope this helps!

If you have 24v going to the leads on the control board and all connections are tight, your board is bad and will have to be replaced.

You will put the red wire from the blower on the terminal marked "heat" on the control board. Black= high speed Red= low speed Yellow/Blue = med low/ med high Hope this helps!

Hello, hot lead must be attached to the brass terminal. The neutral must be attached to the silver terminal.

400-500

I see no problrm? what is wrong?

Hello, verify if the igniter is receiving a 120 volts from the control board after the pressure switch closes. Sometimes a faulty control board can cause this problem if the igniter and pressure switch are good.

Based on your model number this furnace does not have a pilot light,instead it uses a hot surface igniter.typically it glows and when it gets hot enough the gas valve will open and the burners will light.When the igniter starts to go bad it will glow but not get hot enough to open the gas valve.If your furnace lights and the quickly goes out the flame sensor maybe dirty.

open the top of your unit so that you can see into the burner box
what your looking for should be an orange wire that leeads up to a metal rod
that metal rod should be in the way of the flame when unit is on
this is your flame ground,,, or more commonly known as the flame sensor,,, take this out and goive it a good brush with some steel wool
and reassemble,,
this should clear up you problem

3 blinks is the pressure switch not working i take it you have a reg on the line from the tank ?