raypak 266 Milivolt NG won't fire

[byeloe]

I have the pilot lit and am reading 450 ish when I check the voltage. That drops to 365 ish when I turn up the heat, but the unit will not fire up. Is there a trouble shooting guide for this heater

thanks

 

[Arizonarob]

Hang tight, let me see if I can get you some help.
@ps0303 @JamesW

 

[byeloe]

thanks
I found a manual online. It will fire up when I jump the TH wires and shuts off when I turn the power switch off.
I guess I need to start jumping out the other pieces.
Is there an easy way to access the switches and limits?

 

[ps0303]

I have the pilot lit and am reading 450 ish when I check the voltage. That drops to 365 ish when I turn up the heat, but the unit will not fire up. Is there a trouble shooting guide for this heater

thanks

Sounds like a border line bad thermopile and or a dirty pilot which is not producing a big enough flame to heat it. Is the flame strong or lazy?

 

[byeloe]

not sure how to tell if it is strong or lazy?

 

[byeloe]

Sounds like a border line bad thermopile and or a dirty pilot which is not producing a big enough flame to heat it. Is the flame strong or lazy?

Well I cleaned the contacts that come from the pilot as well as the ones on the thermostat and power switch. The heater will fire up now, however it takes like 10 to 20 seconds after the switch is turned on.

Is that normal?

 

[sktn77a]

Mine takes about 10 seconds to come on. Seems like forever.

 

[ps0303]

Milivolt units are not an instant on in many cases. 450 is still border line for power.

 

[byeloe]

Milivolt units are not an instant on in many cases. 450 is still border line for power.

Hi

What would be causing a loss of power? I believe that I have checked/cleaned the connections

 

[ps0303]

Believe it or not, a bad on/off switch can cause this sort of thing.

 

[byeloe]

Believe it or not, a bad on/off switch can cause this sort of thing.

I see, where is the best place to source a new switch

 

[danpik]

Use an OHM meter to check the switch for resistance instead of firing the parts cannon. It should read 0 ohms. Power piles do go bad over time and loose their ability to output power. Also they can be cleaned if they are dirty which will cause a low power output.

 

[byeloe]

Use an OHM meter to check the switch for resistance instead of firing the parts cannon. It should read 0 ohms. Power piles do go bad over time and loose their ability to output power. Also they can be cleaned if they are dirty which will cause a low power output.

I will try that. If the switch is working, could it still be causing resistance?