How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Phil Your Own Question
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
23932409
Type Your HVAC Question Here...
Phil is online now
A new question is answered every 9 seconds

2002 Ruud Acheiver 90 Plus starts cycle to fire and 2 sec

Customer Question

2002 Ruud Acheiver 90 Plus starts cycle to fire and 2 sec after lite goes out then after three cycles no lite first green light next to yellow light binks steady one time
Submitted: 13 days ago.
Category: HVAC
Expert:  BillyHvac replied 13 days ago.

Hello,

My name is Billy.

Is this the hot surface glow ignition model?

Customer: replied 13 days ago.
no electronic spark model UGRA-07EMAES
Expert:  BillyHvac replied 13 days ago.

just a moment while I pull the specs

Expert:  BillyHvac replied 13 days ago.

thank you for waiting.

At this point have you cleaned the flame sense rod yet?

Customer: replied 13 days ago.
it was clean no build up at all
Expert:  BillyHvac replied 13 days ago.

but you did steel wool it?..the glaze is clear not visible as build up

Expert:  BillyHvac replied 13 days ago.

and if so...is the flame reaching the sensor within 3 seconds and actually engulfing the sensor?..or is not reaching the rod in time?

Customer: replied 13 days ago.
I will steel wool it now and let you know in 10 min.
Customer: replied 13 days ago.
Did it and same cycle, blower turns on, seconds later clicks of ingniter, flame ingites all four tubes and last tube has sensor thatis in middle of flame then out a sec after fourth tube ignites.What does green lite blinking steady one time?
Expert:  BillyHvac replied 13 days ago.

what does the yellow light do when flame ignites?

Customer: replied 13 days ago.
I am watching the flame not the yellow lite. I will watch now. It has yrllow lite and two green to the right of it. the middle or first green lite blinks if I let it cycle three times, the last two cycles no fire though.
Expert:  BillyHvac replied 13 days ago.

see chart regarding lights HERE

Customer: replied 13 days ago.
nothing happens when i click on lights HERE. This time the idnition only made it to the second tube before turning off?
Should I relocte the tube to the first or second tube?
Expert:  BillyHvac replied 13 days ago.

is this natural gas or propane?

Customer: replied 13 days ago.
natural gas and the link did work.
Expert:  BillyHvac replied 13 days ago.

Ok I will try again....basically the yellow light reacts to if it sense flame. If the light is a solid yellow it reads good flame...if dim or flicker it reads poor. Obviously if no flame makes it across the flame light will not light. The green blinking is a soft lockout for failed ignition.

Are the burners rusty?

Have you swapped and/or cleaned?

Customer: replied 13 days ago.
Burners are clean, no rust and I only blew it out after it would not start.
This furnace was inspected before I purchased the house and was not turned on till now from the inspection in June.
Expert:  BillyHvac replied 13 days ago.

Has the gas utility had pressure checked since you purchased?

Customer: replied 13 days ago.
no, I have two houses on the property the main house is fine.
Expert:  BillyHvac replied 13 days ago.

you have few choices...

If the gas is not crossing the burners:

Burner crossover channels are not clean

The gas pressure is too low

This is not possible just from gas supply but the regulator in gas valve also.

Can you post a pic of the gas valve using the attach files link?

Customer: replied 13 days ago.
Here is a photo, clicking link to Add files, nothing happens
Expert:  BillyHvac replied 13 days ago.

Sorry about the glitches...what is the make model of the valve

Customer: replied 13 days ago.
R602, and on handle US 4,714,236 and it is blue on a 3/4 "line
Customer: replied 13 days ago.
tried again and all four lite this time
Expert:  BillyHvac replied 13 days ago.

the valve I need is the big blocky item the gas pipe goes into before it goes to burners

Customer: replied 13 days ago.
Honeywell VR8205h 8016, REG 3.5 ADJ 3-5 range,24V 60 Hz
Expert:  BillyHvac replied 13 days ago.

I hope this works....is this similar to your valve

Click Here

Customer: replied 13 days ago.
Expert:  BillyHvac replied 13 days ago.

Thank you...

See HERE

remove the screw cover and under you will see a white plastic regular screwdriver fitting. Keep count of the rotations and turn clockwise 2 full turns. Try furnace again....just keep track of rotations so we know our start point.

Customer: replied 13 days ago.
It is black and 1/2 turn clock wise stopped, backed off and felt like 1 revolution stopped
Expert:  BillyHvac replied 13 days ago.

ok turn clockwise to bottom out.

Then try. It is normal to have 6 full turns adjustment range on these.

Customer: replied 13 days ago.
Seemed to have more pressure during flame but same all four are lite a second later it went out. This time seemed to slowly go out where before was quicker
Expert:  BillyHvac replied 13 days ago.

Ok, it is now time to check flame rod micoramps and furnace ground.

could be a ground issue

bad ignition control

poor connection of flame sensor

Do you have a meter capable of reading microamps?

Customer: replied 13 days ago.
Not here, can we resume tomorrow afternoon?
Expert:  BillyHvac replied 13 days ago.

sure, just wait to respond until ready.

Billy

Customer: replied 12 days ago.
I have digital multimeter
Customer: replied 12 days ago.
When can you return to help me?
Expert:  BillyHvac replied 12 days ago.

ok, now to check microamps..

set meter to Ua.....unplug sensor wire from board and insert meter lead into the wire end connector...put other meter lead to terminal where sensor plugged into.

you can measure briefly the flame sense reading during 3 seconds of operation...and if needed holding a flame, lighter etc on the sensor and taking reading.

See Here for tips

Customer: replied 12 days ago.
No Ua area on my Harbor freight Multimeter. Used the V mA 200u selection and with a lighter on the sensor got spuatic numbers from 30 to 154 and 198 and 3. Jumped all over during ingnition. Could try again using the 2000 selection if needed.
Expert:  BillyHvac replied 12 days ago.

that should suffice for now.

Do you get any ac volt reading at all if you measure neutral to ground?

Customer: replied 12 days ago.
Tips link does not work
Customer: replied 12 days ago.
What is nuetral to ground? If you mean befoire I cycle the furnace the meter reads 0, 1 or -1.