Modine Hot Dawg won't fire up

[Beeffajitas]

So, going through the pre-cold rituals. Had propane delivered today. Tried to fire up the Modine in the shop. It's not making all the relay/solenoid clicking that it usually does. In the past I have had to cycle the starting sequence to purge air from the propane line, but with no clicking I don't think I've even got to that point. Distribution blower fan will turn on.

Things I've tested so far..
- transformer is producing 24V to the board
- Honeywell control valve LED does light green (it's getting 24V) (no blinking)
- 120V is NOT going to the exhaust fan, after call for heat

Any thoughts?

 

[Jim greengo]

Have you checked all the roll out/limit switches?
Start with simple things.

 

[Specracer]

Have you killed power to the unit (causing a reboot)? And there are not any fault codes blinking?

 

[D45]

Try checking the blade fuse inside, my friend had one bad from factory

$2 later it worked perfectly

Check for fault codes

What size unit?

 

[Beeffajitas]

It's a HD-45AH

I'm not seeing a very complicated control board. I think all the controls happen inside the Honeywell control valve. It's P/N 5H76383.

Looks like this:
https://controlscentral.com/eCatalog/tabid/63/Category/Heating-Gas-Control-Valves/ProductID/506368/PageIndex/14/ViewType/2/Default.aspx

There's one LED on the Honeywell, no blinking. There is a sticker in the unit to identify codes.

This is the only board I see:
https://www.qcsupply.com/20886-modine-terminal-board-with-time-delay-relay.html

I did shut power off a couple of times.

I'm thinking this board is supposed to send a signal to the control valve to start the sequence, but I'm not sure how to test that.

 

[JeepJohn62]

So, going through the pre-cold rituals. Had propane delivered today. Tried to fire up the Modine in the shop. It's not making all the relay/solenoid clicking that it usually does. In the past I have had to cycle the starting sequence to purge air from the propane line, but with no clicking I don't think I've even got to that point. Distribution blower fan will turn on.

Things I've tested so far..
- transformer is producing 24V to the board
- Honeywell control valve LED does light green (it's getting 24V) (no blinking)
- 120V is NOT going to the exhaust fan, after call for heat

Any thoughts?

Is the unit firing up?, but the fan will not function, so it shuts off? I might be able to help. Just fixed mine this week.

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