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Wayne
Wayne, Journeyman
Category: Medium and Heavy Trucks
Satisfied Customers: 9065
Experience:  worked on, Gmc, Macks, Freight liner,Mercedes Benz,,Ford, sterling
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I have a TRI PAC by THERMOKING, This unit will not startup

Customer Question

Hello I have a TRI PAC by THERMOKING, This unit will not startup at all. I Check the fuel pump and when I power in up it seams to be working, to make sure I installed another one I had. But the blower still did not start. I ran the temp up to 90deg, and
the yellow wire gets switched to battery voltage. form what I and tell the is the signal to turn the system on. the red wire is battery voltage and the brown wire is the ground circuit. I don't know how to tell what the inside cab temp, or what the unit is
seeing for the cab temp? Possibly the heater module? Possibly the interface panel?
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Wayne replied 1 year ago.

Hi I'm Wayne

I will help you with this

do you have any codes on the display controller

does the engine run in the A/C mode

let me know

Customer: replied 1 year ago.
ac works
Expert:  Wayne replied 1 year ago.

Hi

So a/c works, engines runs,

what about codes

also do you have the Espar heater on the where it is a separate unit

Customer: replied 1 year ago.
Do not see any faults
Expert:  Wayne replied 1 year ago.

Thank you for that

but does it have the separate Espar heater for heat

or does it heat thru the engine

they came both ways

Customer: replied 1 year ago.
the espar unit
Customer: replied 1 year ago.
I have swape a known good fuel pump. And tested all power and ground circuits. Including the yellow switch wire. All are good
Customer: replied 1 year ago.
Also its kinda strange when i tuen on heat mode the evap fans come on and stay on
Expert:  Wayne replied 1 year ago.

Thank you for that

ok on the bottom of the control unit is a screw in fuse,

make sure that is good

also check for power at the glow plug when you 1st turn it on

Customer: replied 1 year ago.
Do you have a pic of this fuse? What would i be looking for with the glow plug
Expert:  Wayne replied 1 year ago.

Hi

It is just a regular tube fuse like the old days

except it is a slow blow

glow plug , your looking for power to it

if the g/plug does not work, the blower will not come on

Customer: replied 1 year ago.
Ok is there a resistance reading for the glowplug
Expert:  Wayne replied 1 year ago.

Hi

Sorry for the delay

g/plug you just want to see if there is 12+ volts there for now

also check fuse F4 and F 14 they are for the heater circuit

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