Troubleshooting Flowcharts

Nothing Happens

Is Overload

tripped on

starter?

NO

Is Freeze-Stat

open?

YES

Reset & measure FLA

of motor. Is it higher

 

 

 

 

 

 

than rating?

YES

Adjust or

 

Replace

YES

Adjust

or

change Pulley

Blower runs but there is no heat

 

 

 

Is the air flow LED

 

NO

 

Adjust pulley to

 

 

 

 

 

 

 

 

on Flame Saftey

 

 

achieve proper

 

 

 

 

 

 

 

 

 

 

 

illuminated?

 

 

 

 

 

airflow.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is outside air cooler than

 

NO

Proper

 

 

 

 

intake air thermostat

 

 

 

 

economizer

 

 

 

 

 

 

 

 

 

 

 

 

setting?

 

 

 

 

operation

 

NO

YES

 

 

 

YES

Is High Temp.

Limit Tripped?

 

 

Reset

Is end switch on

NO

Adjust or

Motorized

 

Replace

 

Damper closed?

 

actuator

 

NO

 

 

 

 

Is there a

NO

Remote Panel

 

Installed?

 

 

YES

 

 

 

NO

Is Remote set to

"Heat"

 

 

 

 

 

YES

 

 

 

 

Refer to Flame

 

Safety Guide

 

 

 

 

Check wiring

Set Remote

Panel to

"Manual" and "Heat" mode.

Burner lights but

heater stays in

Low Fire

 

No

 

Is there voltage on

Replace

Terminal #17

 

 

FSC

 

 

 

 

Yes

Burner lights but heater

stays in High Fire

Is there a jumper between terminals 2 & 3 on the

Maxitrol Amplifier?

Yes

No

Install Jumper

Are all valves

powered and open?

Yes

With wires 3 & 4 removed from the Maxitrol Amplifier, is there 9.5K to 11K Ohms between the wires?

Yes

Remove Terminal #4

from the Maxitrol

Amplifier. Does the

heater go into High Fire?

No

Check valve wiring

 

 

 

 

or open valves

 

 

 

 

 

 

 

 

 

 

 

No

Replace

 

 

Discharge Air

 

 

 

 

 

 

 

 

 

Sensor

 

 

 

 

 

 

 

Is

there a short or open

No

circuit in Modulating

 

 

Valve? Should be 45-55

 

 

Ohms (60-80 on MR212)

Is there a short circuit in the Remote Temperature Selector or wiring?

No

Is there an open circuit in the Discharge Air Sensor or wiring?

No

Is Plunger in the

Modulating Valve jammed?

Inspect and clean. It

should operate freely in

the sleeve.

No

Foreign object holding valve open. Remove

Yes

Yes

Repair short or

replace

Temperature

Selector

Repair Circuit or

replace the

Discharge Air

Sensor

 

 

 

 

 

 

No

 

 

Yes

 

 

 

 

 

 

 

 

 

Yes

 

Replace

 

 

Replace

 

 

 

 

Modulating

 

 

 

Amplifier

 

 

 

 

 

 

 

Valve

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

With wires 1 & 2

 

 

 

 

 

 

 

 

 

removed from the

No

Replace the

 

 

Maxitrol Amplifier, is

Temperature

 

 

 

 

 

 

 

there 9.5K to 11K Ohms

 

 

 

Selector

 

 

 

between the wires?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

bottom plate and inspect valve and seat. Clean or replace valve.

24

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Energy Tech Laboratories MR212 manual Troubleshooting Flowcharts, Nothing Happens

MR212 specifications

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