EntityFieldQuery - Using FieldCondition [duplicate]

Question

Problem

I'm trying to locate a node using EntityFieldQuery. Using fieldCondition removes all of my search results. What am I doing wrong?

So Far

I've built my function using How to use EntityFieldQuery. It's running in a custom form submit.

function mymodule_form() {

   $query = new EntityFieldQuery();

   $query
     ->entityCondition('entity_type', 'node')
     ->entityCondition('bundle', 'contact_details')
     ->fieldCondition('field_user_reference_manual', 'value', '154');

   $result = $query->execute();

}

If I remove the fieldCondition query line it returns both contact_details nodes that I've created. One has field_user_reference_manual = 154 the other 140

The important values in my MySQL table are:

Field: field_data_field_user_reference_manual

Column: field_user_reference_manual_value